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Issue #16096: Fix several occurrences of potential signed integer overflow. Thanks Serhiy Storchaka.

This commit is contained in:
Mark Dickinson 2012-10-06 18:04:49 +01:00
parent a2028733ef
commit c04ddff290
7 changed files with 30 additions and 35 deletions
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4
Modules/_codecsmodule.c
View File

@ -177,12 +177,12 @@ escape_encode(PyObject *self,
return NULL;
size = PyBytes_GET_SIZE(str);
newsize = 4*size;
if (newsize > PY_SSIZE_T_MAX || newsize / 4 != size) {
if (size > PY_SSIZE_T_MAX / 4) {
PyErr_SetString(PyExc_OverflowError,
"string is too large to encode");
return NULL;
}
newsize = 4*size;
v = PyBytes_FromStringAndSize(NULL, newsize);
if (v == NULL) {

7
Modules/_datetimemodule.c
View File

@ -1265,14 +1265,13 @@ wrap_strftime(PyObject *object, PyObject *format, PyObject *timetuple,
assert(ptoappend != NULL);
assert(ntoappend > 0);
while (usednew + ntoappend > totalnew) {
size_t bigger = totalnew << 1;
if ((bigger >> 1) != totalnew) { /* overflow */
if (totalnew > (PY_SSIZE_T_MAX >> 1)) { /* overflow */
PyErr_NoMemory();
goto Done;
}
if (_PyBytes_Resize(&newfmt, bigger) < 0)
totalnew <<= 1;
if (_PyBytes_Resize(&newfmt, totalnew) < 0)
goto Done;
totalnew = bigger;
pnew = PyBytes_AsString(newfmt) + usednew;
}
memcpy(pnew, ptoappend, ntoappend);

3
Modules/_randommodule.c
View File

@ -284,7 +284,8 @@ random_seed(RandomObject *self, PyObject *args)
n = newn;
if (keyused >= keymax) {
unsigned long bigger = keymax << 1;
if ((bigger >> 1) != keymax) {
if ((bigger >> 1) != keymax ||
bigger > PY_SSIZE_T_MAX / sizeof(*key)) {
PyErr_NoMemory();
goto Done;
}

12
Modules/arraymodule.c
View File

@ -483,11 +483,11 @@ newarrayobject(PyTypeObject *type, Py_ssize_t size, struct arraydescr *descr)
return NULL;
}
nbytes = size * descr->itemsize;
/* Check for overflow */
if (nbytes / descr->itemsize != (size_t)size) {
if (size > PY_SSIZE_T_MAX / descr->itemsize) {
return PyErr_NoMemory();
}
nbytes = size * descr->itemsize;
op = (arrayobject *) type->tp_alloc(type, 0);
if (op == NULL) {
return NULL;
@ -1251,11 +1251,15 @@ array_fromfile(arrayobject *self, PyObject *args)
if (!PyArg_ParseTuple(args, "On:fromfile", &f, &n))
return NULL;
nbytes = n * itemsize;
if (nbytes < 0 || nbytes/itemsize != n) {
if (n < 0) {
PyErr_SetString(PyExc_ValueError, "negative count");
return NULL;
}
if (n > PY_SSIZE_T_MAX / itemsize) {
PyErr_NoMemory();
return NULL;
}
nbytes = n * itemsize;
b = _PyObject_CallMethodId(f, &PyId_read, "n", nbytes);
if (b == NULL)

4
Modules/audioop.c
View File

@ -1108,8 +1108,7 @@ audioop_ratecv(PyObject *self, PyObject *args)
PyErr_SetString(AudioopError, "# of channels should be >= 1");
return NULL;
}
bytes_per_frame = size * nchannels;
if (bytes_per_frame / nchannels != size) {
if (size > INT_MAX / nchannels) {
/* This overflow test is rigorously correct because
both multiplicands are >= 1. Use the argument names
from the docs for the error msg. */
@ -1117,6 +1116,7 @@ audioop_ratecv(PyObject *self, PyObject *args)
"width * nchannels too big for a C int");
return NULL;
}
bytes_per_frame = size * nchannels;
if (weightA < 1 || weightB < 0) {
PyErr_SetString(AudioopError,
"weightA should be >= 1, weightB should be >= 0");

12
Objects/tupleobject.c
View File

@ -96,15 +96,11 @@ PyTuple_New(register Py_ssize_t size)
else
#endif
{
Py_ssize_t nbytes = size * sizeof(PyObject *);
/* Check for overflow */
if (nbytes / sizeof(PyObject *) != (size_t)size ||
(nbytes > PY_SSIZE_T_MAX - sizeof(PyTupleObject) - sizeof(PyObject *)))
{
if (size > (PY_SSIZE_T_MAX - sizeof(PyTupleObject) -
sizeof(PyObject *)) / sizeof(PyObject *)) {
return PyErr_NoMemory();
}
/* nbytes += sizeof(PyTupleObject) - sizeof(PyObject *); */
op = PyObject_GC_NewVar(PyTupleObject, &PyTuple_Type, size);
if (op == NULL)
return NULL;
@ -481,9 +477,9 @@ tuplerepeat(PyTupleObject *a, Py_ssize_t n)
if (Py_SIZE(a) == 0)
return PyTuple_New(0);
}
size = Py_SIZE(a) * n;
if (size/Py_SIZE(a) != n)
if (n > PY_SSIZE_T_MAX / Py_SIZE(a))
return PyErr_NoMemory();
size = Py_SIZE(a) * n;
np = (PyTupleObject *) PyTuple_New(size);
if (np == NULL)
return NULL;

23
Objects/unicodeobject.c
View File

@ -4492,7 +4492,6 @@ _PyUnicode_EncodeUTF7(PyObject *str,
void *data;
Py_ssize_t len;
PyObject *v;
Py_ssize_t allocated;
int inShift = 0;
Py_ssize_t i;
unsigned int base64bits = 0;
@ -4510,11 +4509,9 @@ _PyUnicode_EncodeUTF7(PyObject *str,
return PyBytes_FromStringAndSize(NULL, 0);
/* It might be possible to tighten this worst case */
allocated = 8 * len;
if (allocated / 8 != len)
if (len > PY_SSIZE_T_MAX / 8)
return PyErr_NoMemory();
v = PyBytes_FromStringAndSize(NULL, allocated);
v = PyBytes_FromStringAndSize(NULL, len * 8);
if (v == NULL)
return NULL;
@ -5092,7 +5089,7 @@ _PyUnicode_EncodeUTF32(PyObject *str,
Py_ssize_t len;
PyObject *v;
unsigned char *p;
Py_ssize_t nsize, bytesize, i;
Py_ssize_t nsize, i;
/* Offsets from p for storing byte pairs in the right order. */
#ifdef BYTEORDER_IS_LITTLE_ENDIAN
int iorder[] = {0, 1, 2, 3};
@ -5120,10 +5117,9 @@ _PyUnicode_EncodeUTF32(PyObject *str,
len = PyUnicode_GET_LENGTH(str);
nsize = len + (byteorder == 0);
bytesize = nsize * 4;
if (bytesize / 4 != nsize)
if (nsize > PY_SSIZE_T_MAX / 4)
return PyErr_NoMemory();
v = PyBytes_FromStringAndSize(NULL, bytesize);
v = PyBytes_FromStringAndSize(NULL, nsize * 4);
if (v == NULL)
return NULL;
@ -10159,7 +10155,7 @@ replace(PyObject *self, PyObject *str1,
}
else {
Py_ssize_t n, i, j, ires;
Py_ssize_t product, new_size;
Py_ssize_t new_size;
int rkind = skind;
char *res;
@ -10191,19 +10187,18 @@ replace(PyObject *self, PyObject *str1,
}
/* new_size = PyUnicode_GET_LENGTH(self) + n * (PyUnicode_GET_LENGTH(str2) -
PyUnicode_GET_LENGTH(str1))); */
product = n * (len2-len1);
if ((product / (len2-len1)) != n) {
if (len2 > len1 && len2 - len1 > (PY_SSIZE_T_MAX - slen) / n) {
PyErr_SetString(PyExc_OverflowError,
"replace string is too long");
goto error;
}
new_size = slen + product;
new_size = slen + n * (len2 - len1);
if (new_size == 0) {
Py_INCREF(unicode_empty);
u = unicode_empty;
goto done;
}
if (new_size < 0 || new_size > (PY_SSIZE_T_MAX >> (rkind-1))) {
if (new_size > (PY_SSIZE_T_MAX >> (rkind-1))) {
PyErr_SetString(PyExc_OverflowError,
"replace string is too long");
goto error;