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Added checks for integer overflows, contributed by Google. Some are

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only available if asserts are left in the code, in cases where they
can't be triggered from Python code.
This commit is contained in:
Martin v. Löwis 2008-02-14 11:26:18 +00:00
parent abcb59a1d8
commit 73c01d4101
25 changed files with 464 additions and 59 deletions
Download patch file Download diff file Expand all files Collapse all files

34
Python/compile.c
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@ -225,6 +225,10 @@ _Py_Mangle(PyObject *privateobj, PyObject *ident)
return ident; /* Don't mangle if class is just underscores */
}
plen = strlen(p);
assert(1 <= PY_SSIZE_T_MAX - nlen);
assert(1 + nlen <= PY_SSIZE_T_MAX - plen);
ident = PyString_FromStringAndSize(NULL, 1 + nlen + plen);
if (!ident)
return 0;
@ -620,6 +624,8 @@ markblocks(unsigned char *code, int len)
unsigned int *blocks = (unsigned int *)PyMem_Malloc(len*sizeof(int));
int i,j, opcode, blockcnt = 0;
assert(len <= PY_SIZE_MAX / sizeof(int));
if (blocks == NULL) {
PyErr_NoMemory();
return NULL;
@ -1281,6 +1287,12 @@ 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;
@ -4091,6 +4103,10 @@ assemble_init(struct assembler *a, int nblocks, int firstlineno)
a->a_lnotab = PyString_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) {
@ -4199,10 +4215,14 @@ assemble_lnotab(struct assembler *a, struct instr *i)
nbytes = a->a_lnotab_off + 2 * ncodes;
len = PyString_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 (_PyString_Resize(&a->a_lnotab, len) < 0)
return 0;
}
@ -4221,10 +4241,14 @@ assemble_lnotab(struct assembler *a, struct instr *i)
nbytes = a->a_lnotab_off + 2 * ncodes;
len = PyString_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 (_PyString_Resize(&a->a_lnotab, len) < 0)
return 0;
}
@ -4283,6 +4307,8 @@ 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 (_PyString_Resize(&a->a_bytecode, len * 2) < 0)
return 0;
}