Merged revisions 64114 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r64114 | gregory.p.smith | 2008-06-11 09:41:16 +0200 (mer., 11 juin 2008) | 6 lines

  Merge in release25-maint r60793:

   Added checks for integer overflows, contributed by Google. Some are
   only available if asserts are left in the code, in cases where they
   can't be triggered from Python code.
........

Include/pymem.h

@@ -85,14 +85,18 @@ PyAPI_FUNC(void) PyMem_Free(void *);
  */
 
 #define PyMem_New(type, n) \
-	( (type *) PyMem_Malloc((n) * sizeof(type)) )
+  ( assert((n) <= PY_SIZE_MAX / sizeof(type)) , \
+	( (type *) PyMem_Malloc((n) * sizeof(type)) ) )
 #define PyMem_NEW(type, n) \
-	( (type *) PyMem_MALLOC((n) * sizeof(type)) )
+  ( assert((n) <= PY_SIZE_MAX / sizeof(type)) , \
+	( (type *) PyMem_MALLOC((n) * sizeof(type)) ) )
 
 #define PyMem_Resize(p, type, n) \
-	( (p) = (type *) PyMem_Realloc((p), (n) * sizeof(type)) )
+  ( assert((n) <= PY_SIZE_MAX / sizeof(type)) , \
+	( (p) = (type *) PyMem_Realloc((p), (n) * sizeof(type)) ) )
 #define PyMem_RESIZE(p, type, n) \
-	( (p) = (type *) PyMem_REALLOC((p), (n) * sizeof(type)) )
+  ( assert((n) <= PY_SIZE_MAX / sizeof(type)) , \
+	( (p) = (type *) PyMem_REALLOC((p), (n) * sizeof(type)) ) )
 
 /* PyMem{Del,DEL} are left over from ancient days, and shouldn't be used
  * anymore.  They're just confusing aliases for PyMem_{Free,FREE} now.

Include/pyport.h

@@ -106,6 +106,17 @@ typedef Py_intptr_t	Py_ssize_t;
 #   error "Python needs a typedef for Py_ssize_t in pyport.h."
 #endif
 
+/* Largest possible value of size_t.
+   SIZE_MAX is part of C99, so it might be defined on some
+   platforms. If it is not defined, (size_t)-1 is a portable
+   definition for C89, due to the way signed->unsigned 
+   conversion is defined. */
+#ifdef SIZE_MAX
+#define PY_SIZE_MAX SIZE_MAX
+#else
+#define PY_SIZE_MAX ((size_t)-1)
+#endif
+
 /* Largest positive value of type Py_ssize_t. */
 #define PY_SSIZE_T_MAX ((Py_ssize_t)(((size_t)-1)>>1))
 /* Smallest negative value of type Py_ssize_t. */

Lib/test/test_array.py

@@ -962,6 +962,23 @@ tests.append(FloatTest)
 class DoubleTest(FPTest):
     typecode = 'd'
     minitemsize = 8
+
+    def test_alloc_overflow(self):
+        a = array.array('d', [-1]*65536)
+        try:
+            a *= 65536
+        except MemoryError:
+            pass
+        else:
+            self.fail("a *= 2**16 didn't raise MemoryError")
+        b = array.array('d', [ 2.71828183, 3.14159265, -1])
+        try:
+            b * 1431655766
+        except MemoryError:
+            pass
+        else:
+            self.fail("a * 1431655766 didn't raise MemoryError")
+
 tests.append(DoubleTest)
 
 def test_main(verbose=None):

Modules/_csv.c

@@ -533,6 +533,10 @@ parse_grow_buff(ReaderObj *self)
 		self->field = PyMem_New(Py_UNICODE, self->field_size);
 	}
 	else {
+		if (self->field_size > INT_MAX / 2) {
+			PyErr_NoMemory();
+			return 0;
+		} 
 		self->field_size *= 2;
 		self->field = PyMem_Resize(self->field, Py_UNICODE,
 					   self->field_size);
@@ -1038,6 +1042,12 @@ join_append_data(WriterObj *self, Py_UNICODE *field, int quote_empty,
 static int
 join_check_rec_size(WriterObj *self, int rec_len)
 {
+
+	if (rec_len < 0 || rec_len > INT_MAX - MEM_INCR) {
+		PyErr_NoMemory();
+		return 0;
+	}
+
 	if (rec_len > self->rec_size) {
 		if (self->rec_size == 0) {
 			self->rec_size = (rec_len / MEM_INCR + 1) * MEM_INCR;

Modules/arraymodule.c

@@ -642,6 +642,9 @@ array_concat(arrayobject *a, PyObject *bb)
 		PyErr_BadArgument();
 		return NULL;
 	}
+	if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b)) {
+		return PyErr_NoMemory();
+	}
 	size = Py_SIZE(a) + Py_SIZE(b);
 	np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
 	if (np == NULL) {
@@ -664,6 +667,9 @@ array_repeat(arrayobject *a, Py_ssize_t n)
 	Py_ssize_t nbytes;
 	if (n < 0)
 		n = 0;
+	if ((Py_SIZE(a) != 0) && (n > PY_SSIZE_T_MAX / Py_SIZE(a))) {
+		return PyErr_NoMemory();
+	}
 	size = Py_SIZE(a) * n;
 	np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
 	if (np == NULL)
@@ -853,6 +859,10 @@ array_inplace_repeat(arrayobject *self, Py_ssize_t n)
 		if (n < 0)
 			n = 0;
 		items = self->ob_item;
+		if ((self->ob_descr->itemsize != 0) && 
+			(Py_SIZE(self) > PY_SSIZE_T_MAX / self->ob_descr->itemsize)) {
+			return PyErr_NoMemory();
+		}
 		size = Py_SIZE(self) * self->ob_descr->itemsize;
 		if (n == 0) {
 			PyMem_FREE(items);
@@ -861,6 +871,9 @@ array_inplace_repeat(arrayobject *self, Py_ssize_t n)
 			self->allocated = 0;
 		}
 		else {
+			if (size > PY_SSIZE_T_MAX / n) {
+				return PyErr_NoMemory();
+			}
 			PyMem_Resize(items, char, n * size);
 			if (items == NULL)
 				return PyErr_NoMemory();
@@ -1142,6 +1155,10 @@ array_reduce(arrayobject *array)
 		Py_INCREF(dict);
 	}
 	if (Py_SIZE(array) > 0) {
+		if (array->ob_descr->itemsize 
+				> PY_SSIZE_T_MAX / Py_SIZE(array)) {
+			return PyErr_NoMemory();
+		}
 		result = Py_BuildValue("O(cy#)O", 
 			Py_TYPE(array), 
 			array->ob_descr->typecode,
@@ -1315,6 +1332,9 @@ array_fromlist(arrayobject *self, PyObject *list)
 			if ((*self->ob_descr->setitem)(self,
 					Py_SIZE(self) - n + i, v) != 0) {
 				Py_SIZE(self) -= n;
+				if (itemsize && (Py_SIZE(self) > PY_SSIZE_T_MAX / itemsize)) {
+					return PyErr_NoMemory();
+				}
 				PyMem_RESIZE(item, char,
 					          Py_SIZE(self) * itemsize);
 				self->ob_item = item;
@@ -1373,6 +1393,10 @@ array_fromstring(arrayobject *self, PyObject *args)
 	n = n / itemsize;
 	if (n > 0) {
 		char *item = self->ob_item;
+		if ((n > PY_SSIZE_T_MAX - Py_SIZE(self)) ||
+			((Py_SIZE(self) + n) > PY_SSIZE_T_MAX / itemsize)) {
+				return PyErr_NoMemory();
+		}
 		PyMem_RESIZE(item, char, (Py_SIZE(self) + n) * itemsize);
 		if (item == NULL) {
 			PyErr_NoMemory();
@@ -1398,8 +1422,12 @@ values, as if it had been read from a file using the fromfile() method).");
 static PyObject *
 array_tostring(arrayobject *self, PyObject *unused)
 {
-	return PyBytes_FromStringAndSize(self->ob_item,
+	if (Py_SIZE(self) <= PY_SSIZE_T_MAX / self->ob_descr->itemsize) {
-                                         Py_SIZE(self) * self->ob_descr->itemsize);
+		return PyBytes_FromStringAndSize(self->ob_item,
+				    Py_SIZE(self) * self->ob_descr->itemsize);
+	} else {
+		return PyErr_NoMemory();
+	}
 }
 
 PyDoc_STRVAR(tostring_doc,
@@ -1428,6 +1456,9 @@ array_fromunicode(arrayobject *self, PyObject *args)
 	}
 	if (n > 0) {
 		Py_UNICODE *item = (Py_UNICODE *) self->ob_item;
+		if (Py_SIZE(self) > PY_SSIZE_T_MAX - n) {
+			return PyErr_NoMemory();
+		}
 		PyMem_RESIZE(item, Py_UNICODE, Py_SIZE(self) + n);
 		if (item == NULL) {
 			PyErr_NoMemory();

Modules/audioop.c

@@ -829,7 +829,7 @@ static PyObject *
 audioop_tostereo(PyObject *self, PyObject *args)
 {
         signed char *cp, *ncp;
-        int len, size, val1, val2, val = 0;
+        int len, new_len, size, val1, val2, val = 0;
         double fac1, fac2, fval, maxval;
         PyObject *rv;
         int i;
@@ -846,7 +846,14 @@ audioop_tostereo(PyObject *self, PyObject *args)
                 return 0;
         }
     
-        rv = PyBytes_FromStringAndSize(NULL, len*2);
+        new_len = len*2;
+        if (new_len < 0) {
+                PyErr_SetString(PyExc_MemoryError,
+                                "not enough memory for output buffer");
+                return 0;
+        }
+
+        rv = PyBytes_FromStringAndSize(NULL, new_len);
         if ( rv == 0 )
                 return 0;
         ncp = (signed char *)PyBytes_AsString(rv);
@@ -1009,7 +1016,7 @@ audioop_lin2lin(PyObject *self, PyObject *args)
 {
         signed char *cp;
         unsigned char *ncp;
-        int len, size, size2, val = 0;
+        int len, new_len, size, size2, val = 0;
         PyObject *rv;
         int i, j;
 
@@ -1023,7 +1030,13 @@ audioop_lin2lin(PyObject *self, PyObject *args)
                 return 0;
         }
     
-        rv = PyBytes_FromStringAndSize(NULL, (len/size)*size2);
+        new_len = (len/size)*size2;
+        if (new_len < 0) {
+                PyErr_SetString(PyExc_MemoryError,
+                                "not enough memory for output buffer");
+                return 0;
+        }
+        rv = PyBytes_FromStringAndSize(NULL, new_len);
         if ( rv == 0 )
                 return 0;
         ncp = (unsigned char *)PyBytes_AsString(rv);
@@ -1059,6 +1072,7 @@ audioop_ratecv(PyObject *self, PyObject *args)
         int chan, d, *prev_i, *cur_i, cur_o;
         PyObject *state, *samps, *str, *rv = NULL;
         int bytes_per_frame;
+        size_t alloc_size;
 
         weightA = 1;
         weightB = 0;
@@ -1101,8 +1115,14 @@ audioop_ratecv(PyObject *self, PyObject *args)
         inrate /= d;
         outrate /= d;
 
-        prev_i = (int *) malloc(nchannels * sizeof(int));
+        alloc_size = sizeof(int) * (unsigned)nchannels;
-        cur_i = (int *) malloc(nchannels * sizeof(int));
+        if (alloc_size < nchannels) {
+                PyErr_SetString(PyExc_MemoryError,
+                                "not enough memory for output buffer");
+                return 0;
+        }
+        prev_i = (int *) malloc(alloc_size);
+        cur_i = (int *) malloc(alloc_size);
         if (prev_i == NULL || cur_i == NULL) {
                 (void) PyErr_NoMemory();
                 goto exit;
@@ -1275,7 +1295,7 @@ audioop_ulaw2lin(PyObject *self, PyObject *args)
         unsigned char *cp;
         unsigned char cval;
         signed char *ncp;
-        int len, size, val;
+        int len, new_len, size, val;
         PyObject *rv;
         int i;
 
@@ -1288,12 +1308,18 @@ audioop_ulaw2lin(PyObject *self, PyObject *args)
                 return 0;
         }
     
-        rv = PyBytes_FromStringAndSize(NULL, len*size);
+        new_len = len*size;
+        if (new_len < 0) {
+                PyErr_SetString(PyExc_MemoryError,
+                                "not enough memory for output buffer");
+                return 0;
+        }
+        rv = PyBytes_FromStringAndSize(NULL, new_len);
         if ( rv == 0 )
                 return 0;
         ncp = (signed char *)PyBytes_AsString(rv);
     
-        for ( i=0; i < len*size; i += size ) {
+        for ( i=0; i < new_len; i += size ) {
                 cval = *cp++;
                 val = st_ulaw2linear16(cval);
         
@@ -1343,7 +1369,7 @@ audioop_alaw2lin(PyObject *self, PyObject *args)
         unsigned char *cp;
         unsigned char cval;
         signed char *ncp;
-        int len, size, val;
+        int len, new_len, size, val;
         PyObject *rv;
         int i;
 
@@ -1356,12 +1382,18 @@ audioop_alaw2lin(PyObject *self, PyObject *args)
                 return 0;
         }
     
-        rv = PyBytes_FromStringAndSize(NULL, len*size);
+        new_len = len*size;
+        if (new_len < 0) {
+                PyErr_SetString(PyExc_MemoryError,
+                                "not enough memory for output buffer");
+                return 0;
+        }
+        rv = PyBytes_FromStringAndSize(NULL, new_len);
         if ( rv == 0 )
                 return 0;
         ncp = (signed char *)PyBytes_AsString(rv);
     
-        for ( i=0; i < len*size; i += size ) {
+        for ( i=0; i < new_len; i += size ) {
                 cval = *cp++;
                 val = st_alaw2linear16(cval);
         
@@ -1486,7 +1518,7 @@ audioop_adpcm2lin(PyObject *self, PyObject *args)
 {
         signed char *cp;
         signed char *ncp;
-        int len, size, valpred, step, delta, index, sign, vpdiff;
+        int len, new_len, size, valpred, step, delta, index, sign, vpdiff;
         PyObject *rv, *str, *state;
         int i, inputbuffer = 0, bufferstep;
 
@@ -1508,7 +1540,13 @@ audioop_adpcm2lin(PyObject *self, PyObject *args)
         } else if ( !PyArg_ParseTuple(state, "ii", &valpred, &index) )
                 return 0;
     
-        str = PyBytes_FromStringAndSize(NULL, len*size*2);
+        new_len = len*size*2;
+        if (new_len < 0) {
+                PyErr_SetString(PyExc_MemoryError,
+                                "not enough memory for output buffer");
+                return 0;
+        }
+        str = PyBytes_FromStringAndSize(NULL, new_len);
         if ( str == 0 )
                 return 0;
         ncp = (signed char *)PyBytes_AsString(str);
@@ -1516,7 +1554,7 @@ audioop_adpcm2lin(PyObject *self, PyObject *args)
         step = stepsizeTable[index];
         bufferstep = 0;
     
-        for ( i=0; i < len*size*2; i += size ) {
+        for ( i=0; i < new_len; i += size ) {
                 /* Step 1 - get the delta value and compute next index */
                 if ( bufferstep ) {
                         delta = inputbuffer & 0xf;

Modules/binascii.c

@@ -198,6 +198,8 @@ binascii_a2b_uu(PyObject *self, PyObject *args)
 	if ( !PyArg_ParseTuple(args, "t#:a2b_uu", &ascii_data, &ascii_len) )
 		return NULL;
 
+	assert(ascii_len >= 0);
+
 	/* First byte: binary data length (in bytes) */
 	bin_len = (*ascii_data++ - ' ') & 077;
 	ascii_len--;
@@ -355,6 +357,11 @@ binascii_a2b_base64(PyObject *self, PyObject *args)
 	if ( !PyArg_ParseTuple(args, "t#:a2b_base64", &ascii_data, &ascii_len) )
 		return NULL;
 
+	assert(ascii_len >= 0);
+
+	if (ascii_len > PY_SSIZE_T_MAX - 3)
+		return PyErr_NoMemory();
+
 	bin_len = ((ascii_len+3)/4)*3; /* Upper bound, corrected later */
 
 	/* Allocate the buffer */
@@ -448,6 +455,9 @@ binascii_b2a_base64(PyObject *self, PyObject *args)
 
 	if ( !PyArg_ParseTuple(args, "s#:b2a_base64", &bin_data, &bin_len) )
 		return NULL;
+
+	assert(bin_len >= 0);
+
 	if ( bin_len > BASE64_MAXBIN ) {
 		PyErr_SetString(Error, "Too much data for base64 line");
 		return NULL;
@@ -507,6 +517,11 @@ binascii_a2b_hqx(PyObject *self, PyObject *args)
 	if ( !PyArg_ParseTuple(args, "t#:a2b_hqx", &ascii_data, &len) )
 		return NULL;
 
+	assert(len >= 0);
+
+	if (len > PY_SSIZE_T_MAX - 2)
+		return PyErr_NoMemory();
+
 	/* Allocate a string that is too big (fixed later) 
 	   Add two to the initial length to prevent interning which
 	   would preclude subsequent resizing.  */
@@ -574,6 +589,11 @@ binascii_rlecode_hqx(PyObject *self, PyObject *args)
 	if ( !PyArg_ParseTuple(args, "s#:rlecode_hqx", &in_data, &len) )
 		return NULL;
 
+	assert(len >= 0);
+
+	if (len > PY_SSIZE_T_MAX / 2 - 2)
+		return PyErr_NoMemory();
+
 	/* Worst case: output is twice as big as input (fixed later) */
 	if ( (rv=PyBytes_FromStringAndSize(NULL, len*2+2)) == NULL )
 		return NULL;
@@ -627,6 +647,11 @@ binascii_b2a_hqx(PyObject *self, PyObject *args)
 	if ( !PyArg_ParseTuple(args, "s#:b2a_hqx", &bin_data, &len) )
 		return NULL;
 
+	assert(len >= 0);
+
+	if (len > PY_SSIZE_T_MAX / 2 - 2)
+		return PyErr_NoMemory();
+
 	/* Allocate a buffer that is at least large enough */
 	if ( (rv=PyBytes_FromStringAndSize(NULL, len*2+2)) == NULL )
 		return NULL;
@@ -669,9 +694,13 @@ binascii_rledecode_hqx(PyObject *self, PyObject *args)
 	if ( !PyArg_ParseTuple(args, "s#:rledecode_hqx", &in_data, &in_len) )
 		return NULL;
 
+	assert(in_len >= 0);
+
 	/* Empty string is a special case */
 	if ( in_len == 0 )
 		return PyBytes_FromStringAndSize("", 0);
+	else if (in_len > PY_SSIZE_T_MAX / 2)
+		return PyErr_NoMemory();
 
 	/* Allocate a buffer of reasonable size. Resized when needed */
 	out_len = in_len*2;
@@ -697,6 +726,7 @@ binascii_rledecode_hqx(PyObject *self, PyObject *args)
 #define OUTBYTE(b) \
 	do { \
 		 if ( --out_len_left < 0 ) { \
+			  if ( out_len > PY_SSIZE_T_MAX / 2) return PyErr_NoMemory(); \
 			  if (_PyBytes_Resize(&rv, 2*out_len) < 0) \
 			    { Py_DECREF(rv); return NULL; } \
 			  out_data = (unsigned char *)PyBytes_AS_STRING(rv) \
@@ -769,7 +799,7 @@ binascii_crc_hqx(PyObject *self, PyObject *args)
 	if ( !PyArg_ParseTuple(args, "s#i:crc_hqx", &bin_data, &len, &crc) )
 		return NULL;
 
-	while(len--) {
+	while(len-- > 0) {
 		crc=((crc<<8)&0xff00)^crctab_hqx[((crc>>8)&0xff)^*bin_data++];
 	}
 
@@ -925,7 +955,7 @@ binascii_crc32(PyObject *self, PyObject *args)
 		return NULL;
 
 	crc = ~ crc;
-	while (len--) {
+	while (len-- > 0) {
 		crc = crc_32_tab[(crc ^ *bin_data++) & 0xff] ^ (crc >> 8);
 		/* Note:  (crc >> 8) MUST zero fill on left */
 	}
@@ -948,6 +978,10 @@ binascii_hexlify(PyObject *self, PyObject *args)
 	if (!PyArg_ParseTuple(args, "s#:b2a_hex", &argbuf, &arglen))
 		return NULL;
 
+	assert(arglen >= 0);
+	if (arglen > PY_SSIZE_T_MAX / 2)
+		return PyErr_NoMemory();
+
 	retval = PyBytes_FromStringAndSize(NULL, arglen*2);
 	if (!retval)
 		return NULL;
@@ -999,6 +1033,8 @@ binascii_unhexlify(PyObject *self, PyObject *args)
 	if (!PyArg_ParseTuple(args, "s#:a2b_hex", &argbuf, &arglen))
 		return NULL;
 
+	assert(arglen >= 0);
+
 	/* XXX What should we do about strings with an odd length?  Should
 	 * we add an implicit leading zero, or a trailing zero?  For now,
 	 * raise an exception.

Modules/cjkcodecs/multibytecodec.c

@@ -172,13 +172,17 @@ static PyGetSetDef codecctx_getsets[] = {
 static int
 expand_encodebuffer(MultibyteEncodeBuffer *buf, Py_ssize_t esize)
 {
-	Py_ssize_t orgpos, orgsize;
+	Py_ssize_t orgpos, orgsize, incsize;
 
 	orgpos = (Py_ssize_t)((char *)buf->outbuf -
 				PyBytes_AS_STRING(buf->outobj));
 	orgsize = PyBytes_GET_SIZE(buf->outobj);
-	if (_PyBytes_Resize(&buf->outobj, orgsize + (
+	incsize = (esize < (orgsize >> 1) ? (orgsize >> 1) | 1 : esize);
-	    esize < (orgsize >> 1) ? (orgsize >> 1) | 1 : esize)) == -1)
+
+	if (orgsize > PY_SSIZE_T_MAX - incsize)
+		return -1;
+
+	if (_PyBytes_Resize(&buf->outobj, orgsize + incsize) == -1)
 		return -1;
 
 	buf->outbuf = (unsigned char *)PyBytes_AS_STRING(buf->outobj) +orgpos;
@@ -481,6 +485,12 @@ multibytecodec_encode(MultibyteCodec *codec,
 	buf.excobj = NULL;
 	buf.inbuf = buf.inbuf_top = *data;
 	buf.inbuf_end = buf.inbuf_top + datalen;
+
+	if (datalen > (PY_SSIZE_T_MAX - 16) / 2) {
+		PyErr_NoMemory();
+		goto errorexit;
+	}
+
 	buf.outobj = PyBytes_FromStringAndSize(NULL, datalen * 2 + 16);
 	if (buf.outobj == NULL)
 		goto errorexit;
@@ -743,6 +753,11 @@ encoder_encode_stateful(MultibyteStatefulEncoderContext *ctx,
 	origpending = ctx->pendingsize;
 
 	if (origpending > 0) {
+		if (datalen > PY_SSIZE_T_MAX - ctx->pendingsize) {
+			PyErr_NoMemory();
+			/* inbuf_tmp == NULL */
+			goto errorexit;
+		}
 		inbuf_tmp = PyMem_New(Py_UNICODE, datalen + ctx->pendingsize);
 		if (inbuf_tmp == NULL)
 			goto errorexit;
@@ -805,9 +820,10 @@ decoder_append_pending(MultibyteStatefulDecoderContext *ctx,
 	Py_ssize_t npendings;
 
 	npendings = (Py_ssize_t)(buf->inbuf_end - buf->inbuf);
-	if (npendings + ctx->pendingsize > MAXDECPENDING) {
+	if (npendings + ctx->pendingsize > MAXDECPENDING ||
-		PyErr_SetString(PyExc_UnicodeError, "pending buffer overflow");
+		npendings > PY_SSIZE_T_MAX - ctx->pendingsize) {
-		return -1;
+			PyErr_SetString(PyExc_UnicodeError, "pending buffer overflow");
+			return -1;
 	}
 	memcpy(ctx->pending + ctx->pendingsize, buf->inbuf, npendings);
 	ctx->pendingsize += npendings;
@@ -1009,7 +1025,7 @@ mbidecoder_decode(MultibyteIncrementalDecoderObject *self,
 		  PyObject *args, PyObject *kwargs)
 {
 	MultibyteDecodeBuffer buf;
-	char *data, *wdata;
+	char *data, *wdata = NULL;
 	Py_ssize_t wsize, finalsize = 0, size, origpending;
 	int final = 0;
 
@@ -1025,6 +1041,10 @@ mbidecoder_decode(MultibyteIncrementalDecoderObject *self,
 		wdata = data;
 	}
 	else {
+		if (size > PY_SSIZE_T_MAX - self->pendingsize) {
+			PyErr_NoMemory();
+			goto errorexit;
+		}
 		wsize = size + self->pendingsize;
 		wdata = PyMem_Malloc(wsize);
 		if (wdata == NULL)
@@ -1244,6 +1264,10 @@ mbstreamreader_iread(MultibyteStreamReaderObject *self,
 			PyObject *ctr;
 			char *ctrdata;
 
+			if (PyBytes_GET_SIZE(cres) > PY_SSIZE_T_MAX - self->pendingsize) {
+				PyErr_NoMemory();
+				goto errorexit;
+            }
 			rsize = PyBytes_GET_SIZE(cres) + self->pendingsize;
 			ctr = PyBytes_FromStringAndSize(NULL, rsize);
 			if (ctr == NULL)

Modules/datetimemodule.c

@@ -1111,6 +1111,8 @@ format_utcoffset(char *buf, size_t buflen, const char *sep,
 	char sign;
 	int none;
 
+	assert(buflen >= 1);
+
 	offset = call_utcoffset(tzinfo, tzinfoarg, &none);
 	if (offset == -1 && PyErr_Occurred())
 		return -1;
@@ -1250,6 +1252,11 @@ wrap_strftime(PyObject *object, PyObject *format, PyObject *timetuple,
 	 * a new format.  Since computing the replacements for those codes
 	 * is expensive, don't unless they're actually used.
 	 */
+	if (flen > INT_MAX - 1) {
+		PyErr_NoMemory();
+		goto Done;
+	}
+
 	totalnew = flen + 1;	/* realistic if no %z/%Z */
 	newfmt = PyBytes_FromStringAndSize(NULL, totalnew);
 	if (newfmt == NULL) goto Done;

Objects/listobject.c

@@ -45,7 +45,16 @@ list_resize(PyListObject *self, Py_ssize_t newsize)
 	 * system realloc().
 	 * The growth pattern is:  0, 4, 8, 16, 25, 35, 46, 58, 72, 88, ...
 	 */
-	new_allocated = (newsize >> 3) + (newsize < 9 ? 3 : 6) + newsize;
+	new_allocated = (newsize >> 3) + (newsize < 9 ? 3 : 6);
+
+	/* check for integer overflow */
+	if (new_allocated > PY_SIZE_MAX - newsize) {
+		PyErr_NoMemory();
+		return -1;
+	} else {
+		new_allocated += newsize;
+	}
+
 	if (newsize == 0)
 		new_allocated = 0;
 	items = self->ob_item;
@@ -118,8 +127,9 @@ PyList_New(Py_ssize_t size)
 		return NULL;
 	}
 	nbytes = size * sizeof(PyObject *);
-	/* Check for overflow */
+	/* Check for overflow without an actual overflow,
-	if (nbytes / sizeof(PyObject *) != (size_t)size)
+	 *  which can cause compiler to optimise out */
+	if (size > PY_SIZE_MAX / sizeof(PyObject *))
 		return PyErr_NoMemory();
 	if (numfree) {
 		numfree--;
@@ -1323,6 +1333,10 @@ merge_getmem(MergeState *ms, Py_ssize_t need)
 	 * we don't care what's in the block.
 	 */
 	merge_freemem(ms);
+	if (need > PY_SSIZE_T_MAX / sizeof(PyObject*)) {
+		PyErr_NoMemory();
+		return -1;
+	}
 	ms->a = (PyObject **)PyMem_Malloc(need * sizeof(PyObject*));
 	if (ms->a) {
 		ms->alloced = need;
@@ -2415,6 +2429,8 @@ list_ass_subscript(PyListObject* self, PyObject* item, PyObject* value)
 				step = -step;
 			}
 
+			assert(slicelength <= PY_SIZE_MAX / sizeof(PyObject*));
+
 			garbage = (PyObject**)
 				PyMem_MALLOC(slicelength*sizeof(PyObject*));
 			if (!garbage) {

Objects/memoryobject.c

@@ -151,8 +151,11 @@ _indirect_copy_nd(char *dest, Py_buffer *view, char fort)
         char *ptr;
         void (*func)(int, Py_ssize_t *, Py_ssize_t *);
 
+        if (view->ndim > PY_SSIZE_T_MAX / sizeof(Py_ssize_t)) {
+                PyErr_NoMemory();
+                return -1;
+        }
 
-        /* XXX(nnorwitz): need to check for overflow! */
         indices = (Py_ssize_t *)PyMem_Malloc(sizeof(Py_ssize_t)*view->ndim);
         if (indices == NULL) {
                 PyErr_NoMemory();

Objects/obmalloc.c

@@ -526,9 +526,9 @@ new_arena(void)
 		numarenas = maxarenas ? maxarenas << 1 : INITIAL_ARENA_OBJECTS;
 		if (numarenas <= maxarenas)
 			return NULL;	/* overflow */
-		nbytes = numarenas * sizeof(*arenas);
+		if (numarenas > PY_SIZE_MAX / sizeof(*arenas))
-		if (nbytes / sizeof(*arenas) != numarenas)
 			return NULL;	/* overflow */
+		nbytes = numarenas * sizeof(*arenas);
 		arenaobj = (struct arena_object *)realloc(arenas, nbytes);
 		if (arenaobj == NULL)
 			return NULL;

Parser/node.c

@@ -91,6 +91,9 @@ PyNode_AddChild(register node *n1, int type, char *str, int lineno, int col_offs
 	if (current_capacity < 0 || required_capacity < 0)
 		return E_OVERFLOW;
 	if (current_capacity < required_capacity) {
+		if (required_capacity > PY_SIZE_MAX / sizeof(node)) {
+			return E_NOMEM;
+		}
 		n = n1->n_child;
 		n = (node *) PyObject_REALLOC(n,
 					      required_capacity * sizeof(node));

Python/asdl.c

@@ -5,8 +5,22 @@ asdl_seq *
 asdl_seq_new(int size, PyArena *arena)
 {
 	asdl_seq *seq = NULL;
-	size_t n = sizeof(asdl_seq) +
+	size_t n = (size ? (sizeof(void *) * (size - 1)) : 0);
-			(size ? (sizeof(void *) * (size - 1)) : 0);
+
+	/* check size is sane */
+	if (size < 0 || size == INT_MIN || 
+		(size && ((size - 1) > (PY_SIZE_MAX / sizeof(void *))))) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	/* check if size can be added safely */
+	if (n > PY_SIZE_MAX - sizeof(asdl_seq)) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	n += sizeof(asdl_seq);
 
 	seq = (asdl_seq *)PyArena_Malloc(arena, n);
 	if (!seq) {
@@ -22,8 +36,22 @@ asdl_int_seq *
 asdl_int_seq_new(int size, PyArena *arena)
 {
 	asdl_int_seq *seq = NULL;
-	size_t n = sizeof(asdl_seq) +
+	size_t n = (size ? (sizeof(void *) * (size - 1)) : 0);
-			(size ? (sizeof(int) * (size - 1)) : 0);
+
+	/* check size is sane */
+	if (size < 0 || size == INT_MIN || 
+		(size && ((size - 1) > (PY_SIZE_MAX / sizeof(void *))))) {
+			PyErr_NoMemory();
+			return NULL;
+	}
+
+	/* check if size can be added safely */
+	if (n > PY_SIZE_MAX - sizeof(asdl_seq)) {
+		PyErr_NoMemory();
+		return NULL;
+	}
+
+	n += sizeof(asdl_seq);
 
 	seq = (asdl_int_seq *)PyArena_Malloc(arena, n);
 	if (!seq) {

Python/ast.c

@@ -3145,6 +3145,9 @@ decode_unicode(struct compiling *c, const char *s, size_t len, int rawmode, cons
         buf = (char *)s;
         u = NULL;
     } else {
+        /* check for integer overflow */
+        if (len > PY_SIZE_MAX / 4)
+            return NULL;
         /* "\XX" may become "\u005c\uHHLL" (12 bytes) */
         u = PyBytes_FromStringAndSize((char *)NULL, len * 4);
         if (u == NULL)

Python/compile.c

@@ -227,6 +227,10 @@ _Py_Mangle(PyObject *privateobj, PyObject *ident)
 		return ident; /* Don't mangle if class is just underscores */
 	}
 	plen = Py_UNICODE_strlen(p);
+
+	assert(1 <= PY_SSIZE_T_MAX - nlen);
+	assert(1 + nlen <= PY_SSIZE_T_MAX - plen);
+
 	ident = PyUnicode_FromStringAndSize(NULL, 1 + nlen + plen);
 	if (!ident)
 		return 0;
@@ -635,6 +639,12 @@ compiler_next_instr(struct compiler *c, basicblock *b)
 		size_t oldsize, newsize;
 		oldsize = b->b_ialloc * sizeof(struct instr);
 		newsize = oldsize << 1;
+
+		if (oldsize > (PY_SIZE_MAX >> 1)) {
+			PyErr_NoMemory();
+			return -1;
+		}
+
 		if (newsize == 0) {
 			PyErr_NoMemory();
 			return -1;
@@ -3711,6 +3721,10 @@ assemble_init(struct assembler *a, int nblocks, int firstlineno)
 	a->a_lnotab = PyBytes_FromStringAndSize(NULL, DEFAULT_LNOTAB_SIZE);
 	if (!a->a_lnotab)
 		return 0;
+	if (nblocks > PY_SIZE_MAX / sizeof(basicblock *)) {
+		PyErr_NoMemory();
+		return 0;
+	}
 	a->a_postorder = (basicblock **)PyObject_Malloc(
 					    sizeof(basicblock *) * nblocks);
 	if (!a->a_postorder) {
@@ -3819,10 +3833,14 @@ assemble_lnotab(struct assembler *a, struct instr *i)
 		nbytes = a->a_lnotab_off + 2 * ncodes;
 		len = PyBytes_GET_SIZE(a->a_lnotab);
 		if (nbytes >= len) {
-			if (len * 2 < nbytes)
+			if ((len <= INT_MAX / 2) && (len * 2 < nbytes))
 				len = nbytes;
-			else
+			else if (len <= INT_MAX / 2)
 				len *= 2;
+			else {
+				PyErr_NoMemory();
+				return 0;
+			}
 			if (_PyBytes_Resize(&a->a_lnotab, len) < 0)
 				return 0;
 		}
@@ -3841,10 +3859,14 @@ assemble_lnotab(struct assembler *a, struct instr *i)
 		nbytes = a->a_lnotab_off + 2 * ncodes;
 		len = PyBytes_GET_SIZE(a->a_lnotab);
 		if (nbytes >= len) {
-			if (len * 2 < nbytes)
+			if ((len <= INT_MAX / 2) && len * 2 < nbytes)
 				len = nbytes;
-			else
+			else if (len <= INT_MAX / 2)
 				len *= 2;
+			else {
+				PyErr_NoMemory();
+				return 0;
+			}
 			if (_PyBytes_Resize(&a->a_lnotab, len) < 0)
 				return 0;
 		}
@@ -3903,6 +3925,8 @@ assemble_emit(struct assembler *a, struct instr *i)
 	if (i->i_lineno && !assemble_lnotab(a, i))
 		return 0;
 	if (a->a_offset + size >= len) {
+		if (len > PY_SSIZE_T_MAX / 2)
+			return 0;
 		if (_PyBytes_Resize(&a->a_bytecode, len * 2) < 0)
 		    return 0;
 	}