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Issue #17119: Fixed integer overflows when processing large strings and tuples

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in the tkinter module.
This commit is contained in:
Serhiy Storchaka 2013-08-21 21:43:08 +03:00
commit 4e4088d273
3 changed files with 41 additions and 7 deletions
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29
Modules/_tkinter.c
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@ -47,6 +47,9 @@ Copyright (C) 1994 Steen Lumholt.
#define PyBool_FromLong PyLong_FromLong
#endif
#define CHECK_SIZE(size, elemsize) \
((size_t)(size) <= Py_MAX((size_t)INT_MAX, UINT_MAX / (size_t)(elemsize)))
/* Starting with Tcl 8.4, many APIs offer const-correctness. Unfortunately,
making _tkinter correct for this API means to break earlier
versions. USE_COMPAT_CONST allows to make _tkinter work with both 8.4 and
@ -850,12 +853,18 @@ AsObj(PyObject *value)
else if (PyFloat_Check(value))
return Tcl_NewDoubleObj(PyFloat_AS_DOUBLE(value));
else if (PyTuple_Check(value)) {
Tcl_Obj **argv = (Tcl_Obj**)
ckalloc(PyTuple_Size(value)*sizeof(Tcl_Obj*));
int i;
Tcl_Obj **argv;
Py_ssize_t size, i;
size = PyTuple_Size(value);
if (!CHECK_SIZE(size, sizeof(Tcl_Obj *))) {
PyErr_SetString(PyExc_OverflowError, "tuple is too long");
return NULL;
}
argv = (Tcl_Obj **) ckalloc(((size_t)size) * sizeof(Tcl_Obj *));
if(!argv)
return 0;
for(i=0;i<PyTuple_Size(value);i++)
for (i = 0; i < size; i++)
argv[i] = AsObj(PyTuple_GetItem(value,i));
result = Tcl_NewListObj(PyTuple_Size(value), argv);
ckfree(FREECAST argv);
@ -874,6 +883,10 @@ AsObj(PyObject *value)
inbuf = PyUnicode_DATA(value);
size = PyUnicode_GET_LENGTH(value);
if (!CHECK_SIZE(size, sizeof(Tcl_UniChar))) {
PyErr_SetString(PyExc_OverflowError, "string is too long");
return NULL;
}
kind = PyUnicode_KIND(value);
allocsize = ((size_t)size) * sizeof(Tcl_UniChar);
outbuf = (Tcl_UniChar*)ckalloc(allocsize);
@ -1029,7 +1042,7 @@ static Tcl_Obj**
Tkapp_CallArgs(PyObject *args, Tcl_Obj** objStore, int *pobjc)
{
Tcl_Obj **objv = objStore;
int objc = 0, i;
Py_ssize_t objc = 0, i;
if (args == NULL)
/* do nothing */;
@ -1044,7 +1057,11 @@ Tkapp_CallArgs(PyObject *args, Tcl_Obj** objStore, int *pobjc)
objc = PyTuple_Size(args);
if (objc > ARGSZ) {
objv = (Tcl_Obj **)ckalloc(objc * sizeof(char *));
if (!CHECK_SIZE(objc, sizeof(Tcl_Obj *))) {
PyErr_SetString(PyExc_OverflowError, "tuple is too long");
return NULL;
}
objv = (Tcl_Obj **)ckalloc(((size_t)objc) * sizeof(Tcl_Obj *));
if (objv == NULL) {
PyErr_NoMemory();
objc = 0;