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SUSE:SLE-12-SP5:GA
python-doc.8549
python-2.7.13-overflow_check.patch
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File python-2.7.13-overflow_check.patch of Package python-doc.8549
Index: Python-2.7.13/Objects/unicodeobject.c =================================================================== --- Python-2.7.13.orig/Objects/unicodeobject.c +++ Python-2.7.13/Objects/unicodeobject.c @@ -5732,20 +5732,20 @@ PyUnicode_Join(PyObject *separator, PyOb /* Make sure we have enough space for the separator and the item. */ itemlen = PyUnicode_GET_SIZE(item); - new_res_used = res_used + itemlen; - if (new_res_used < 0) + if (res_used > PY_SSIZE_T_MAX - itemlen) goto Overflow; + new_res_used = res_used + itemlen; if (i < seqlen - 1) { - new_res_used += seplen; - if (new_res_used < 0) + if (new_res_used > PY_SSIZE_T_MAX - seplen) goto Overflow; + new_res_used += seplen; } if (new_res_used > res_alloc) { /* double allocated size until it's big enough */ do { - res_alloc += res_alloc; - if (res_alloc <= 0) + if (res_alloc >= PY_SSIZE_T_MAX - res_alloc) goto Overflow; + res_alloc += res_alloc; } while (new_res_used > res_alloc); if (_PyUnicode_Resize(&res, res_alloc) < 0) { Py_DECREF(item); @@ -5943,7 +5943,7 @@ PyObject *replace(PyUnicodeObject *self, } else { Py_ssize_t n, i, j; - Py_ssize_t product, new_size, delta; + Py_ssize_t new_size, delta; Py_UNICODE *p; /* replace strings */ @@ -5956,18 +5956,12 @@ PyObject *replace(PyUnicodeObject *self, if (delta == 0) { new_size = self->length; } else { - product = n * (str2->length - str1->length); - if ((product / (str2->length - str1->length)) != n) { - PyErr_SetString(PyExc_OverflowError, - "replace string is too long"); - return NULL; - } - new_size = self->length + product; - if (new_size < 0) { + if (str2->length - str1->length > (PY_SSIZE_T_MAX - self->length) / n) { PyErr_SetString(PyExc_OverflowError, "replace string is too long"); return NULL; } + new_size = self->length + n * (str2->length - str1->length); } u = _PyUnicode_New(new_size); if (!u) Index: Python-2.7.13/Objects/tupleobject.c =================================================================== --- Python-2.7.13.orig/Objects/tupleobject.c +++ Python-2.7.13/Objects/tupleobject.c @@ -446,9 +446,9 @@ tupleconcat(register PyTupleObject *a, r return NULL; } #define b ((PyTupleObject *)bb) - size = Py_SIZE(a) + Py_SIZE(b); - if (size < 0) + if (Py_SIZE(a) > PY_SSIZE_T_MAX - Py_SIZE(b)) return PyErr_NoMemory(); + size = Py_SIZE(a) + Py_SIZE(b); np = (PyTupleObject *) PyTuple_New(size); if (np == NULL) { return NULL; @@ -490,9 +490,9 @@ tuplerepeat(PyTupleObject *a, Py_ssize_t 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; diff -r 5ea0fef6ec53 Objects/bytearrayobject.c --- a/Objects/bytearrayobject.c Wed Dec 28 15:41:09 2016 -0800 +++ b/Objects/bytearrayobject.c Thu Jan 05 14:05:29 2017 +0800 @@ -1571,31 +1571,30 @@ { char *self_s, *result_s; Py_ssize_t self_len, result_len; - Py_ssize_t count, i, product; + Py_ssize_t count, i; PyByteArrayObject *result; self_len = PyByteArray_GET_SIZE(self); - /* 1 at the end plus 1 after every character */ - count = self_len+1; - if (maxcount < count) + /* 1 at the end plus 1 after every character; + count = min(maxcount, self_len + 1) */ + if (maxcount <= self_len) { count = maxcount; + } + else { + /* Can't overflow: self_len + 1 <= maxcount <= PY_SSIZE_T_MAX. */ + count = self_len + 1; + } /* Check for overflow */ /* result_len = count * to_len + self_len; */ - product = count * to_len; - if (product / to_len != count) { + assert(count > 0); + if (to_len > (PY_SSIZE_T_MAX - self_len) / count) { PyErr_SetString(PyExc_OverflowError, - "replace string is too long"); + "replace bytes is too long"); return NULL; } - result_len = product + self_len; - if (result_len < 0) { - PyErr_SetString(PyExc_OverflowError, - "replace string is too long"); - return NULL; - } - + result_len = count * to_len + self_len; if (! (result = (PyByteArrayObject *) PyByteArray_FromStringAndSize(NULL, result_len)) ) return NULL; @@ -1824,7 +1823,7 @@ char *self_s, *result_s; char *start, *next, *end; Py_ssize_t self_len, result_len; - Py_ssize_t count, product; + Py_ssize_t count; PyByteArrayObject *result; self_s = PyByteArray_AS_STRING(self); @@ -1838,16 +1837,12 @@ /* use the difference between current and new, hence the "-1" */ /* result_len = self_len + count * (to_len-1) */ - product = count * (to_len-1); - if (product / (to_len-1) != count) { + assert(count > 0); + if (to_len - 1 > (PY_SSIZE_T_MAX - self_len) / count) { PyErr_SetString(PyExc_OverflowError, "replace bytes is too long"); return NULL; } - result_len = self_len + product; - if (result_len < 0) { - PyErr_SetString(PyExc_OverflowError, "replace bytes is too long"); - return NULL; - } + result_len = self_len + count * (to_len - 1); if ( (result = (PyByteArrayObject *) PyByteArray_FromStringAndSize(NULL, result_len)) == NULL) @@ -1891,7 +1886,7 @@ char *self_s, *result_s; char *start, *next, *end; Py_ssize_t self_len, result_len; - Py_ssize_t count, offset, product; + Py_ssize_t count, offset; PyByteArrayObject *result; self_s = PyByteArray_AS_STRING(self); @@ -1908,16 +1903,12 @@ /* Check for overflow */ /* result_len = self_len + count * (to_len-from_len) */ - product = count * (to_len-from_len); - if (product / (to_len-from_len) != count) { + assert(count > 0); + if (to_len - from_len > (PY_SSIZE_T_MAX - self_len) / count) { PyErr_SetString(PyExc_OverflowError, "replace bytes is too long"); return NULL; } - result_len = self_len + product; - if (result_len < 0) { - PyErr_SetString(PyExc_OverflowError, "replace bytes is too long"); - return NULL; - } + result_len = self_len + count * (to_len - from_len); if ( (result = (PyByteArrayObject *) PyByteArray_FromStringAndSize(NULL, result_len)) == NULL) diff -r 5ea0fef6ec53 Objects/stringobject.c --- a/Objects/stringobject.c Wed Dec 28 15:41:09 2016 -0800 +++ b/Objects/stringobject.c Thu Jan 05 14:05:29 2017 +0800 @@ -2358,31 +2358,30 @@ { char *self_s, *result_s; Py_ssize_t self_len, result_len; - Py_ssize_t count, i, product; + Py_ssize_t count, i; PyStringObject *result; self_len = PyString_GET_SIZE(self); - /* 1 at the end plus 1 after every character */ - count = self_len+1; - if (maxcount < count) + /* 1 at the end plus 1 after every character; + count = min(maxcount, self_len + 1) */ + if (maxcount <= self_len) { count = maxcount; + } + else { + /* Can't overflow: self_len + 1 <= maxcount <= PY_SSIZE_T_MAX. */ + count = self_len + 1; + } /* Check for overflow */ /* result_len = count * to_len + self_len; */ - product = count * to_len; - if (product / to_len != count) { + assert(count > 0); + if (to_len > (PY_SSIZE_T_MAX - self_len) / count) { PyErr_SetString(PyExc_OverflowError, "replace string is too long"); return NULL; } - result_len = product + self_len; - if (result_len < 0) { - PyErr_SetString(PyExc_OverflowError, - "replace string is too long"); - return NULL; - } - + result_len = count * to_len + self_len; if (! (result = (PyStringObject *) PyString_FromStringAndSize(NULL, result_len)) ) return NULL; @@ -2610,7 +2609,7 @@ char *self_s, *result_s; char *start, *next, *end; Py_ssize_t self_len, result_len; - Py_ssize_t count, product; + Py_ssize_t count; PyStringObject *result; self_s = PyString_AS_STRING(self); @@ -2624,16 +2623,12 @@ /* use the difference between current and new, hence the "-1" */ /* result_len = self_len + count * (to_len-1) */ - product = count * (to_len-1); - if (product / (to_len-1) != count) { + assert(count > 0); + if (to_len - 1 > (PY_SSIZE_T_MAX - self_len) / count) { PyErr_SetString(PyExc_OverflowError, "replace string is too long"); return NULL; } - result_len = self_len + product; - if (result_len < 0) { - PyErr_SetString(PyExc_OverflowError, "replace string is too long"); - return NULL; - } + result_len = self_len + count * (to_len - 1); if ( (result = (PyStringObject *) PyString_FromStringAndSize(NULL, result_len)) == NULL) @@ -2676,7 +2671,7 @@ char *self_s, *result_s; char *start, *next, *end; Py_ssize_t self_len, result_len; - Py_ssize_t count, offset, product; + Py_ssize_t count, offset; PyStringObject *result; self_s = PyString_AS_STRING(self); @@ -2693,16 +2688,12 @@ /* Check for overflow */ /* result_len = self_len + count * (to_len-from_len) */ - product = count * (to_len-from_len); - if (product / (to_len-from_len) != count) { + assert(count > 0); + if (to_len - from_len > (PY_SSIZE_T_MAX - self_len) / count) { PyErr_SetString(PyExc_OverflowError, "replace string is too long"); return NULL; } - result_len = self_len + product; - if (result_len < 0) { - PyErr_SetString(PyExc_OverflowError, "replace string is too long"); - return NULL; - } + result_len = self_len + count * (to_len - from_len); if ( (result = (PyStringObject *) PyString_FromStringAndSize(NULL, result_len)) == NULL)
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