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[3.7] bpo-34395: Fix memory leaks caused by incautious usage of PyMem_Resize(). (GH-8756) #8779

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Merged
miss-islington merged 1 commit into from
Aug 16, 2018
Merged

[3.7] bpo-34395: Fix memory leaks caused by incautious usage of PyMem_Resize(). (GH-8756) #8779

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bpo-34395: Fix memory leaks caused by incautious usage of PyMem_Resiz… 
…e(). (GH-8756)

(cherry picked from commit 67b9cc8)

Co-authored-by: Sergey Fedoseev <[email protected]>
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@sir-sigurd @miss-islington
sir-sigurd authored and miss-islington committed Aug 16, 2018
commit 9e65d2fe0b8aef221a122b2bea308b3b51680ecb
51 changes: 15 additions & 36 deletions Modules/_csv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -554,25 +554,17 @@ parse_save_field(ReaderObj *self)
static int
parse_grow_buff(ReaderObj *self)
{
if (self->field_size == 0) {
self->field_size = 4096;
if (self->field != NULL)
PyMem_Free(self->field);
self->field = PyMem_New(Py_UCS4, self->field_size);
}
else {
Py_UCS4 *field = self->field;
if (self->field_size > PY_SSIZE_T_MAX / 2) {
PyErr_NoMemory();
return 0;
}
self->field_size *= 2;
self->field = PyMem_Resize(field, Py_UCS4, self->field_size);
}
if (self->field == NULL) {
assert((size_t)self->field_size <= PY_SSIZE_T_MAX / sizeof(Py_UCS4));

Py_ssize_t field_size_new = self->field_size ? 2 * self->field_size : 4096;
Py_UCS4 *field_new = self->field;
PyMem_Resize(field_new, Py_UCS4, field_size_new);
if (field_new == NULL) {
PyErr_NoMemory();
return 0;
}
self->field = field_new;
self->field_size = field_size_new;
return 1;
}

Expand Down Expand Up @@ -1088,31 +1080,18 @@ join_append_data(WriterObj *self, unsigned int field_kind, void *field_data,
static int
join_check_rec_size(WriterObj *self, Py_ssize_t rec_len)
{

if (rec_len < 0 || rec_len > PY_SSIZE_T_MAX - MEM_INCR) {
PyErr_NoMemory();
return 0;
}
assert(rec_len >= 0);

if (rec_len > self->rec_size) {
if (self->rec_size == 0) {
self->rec_size = (rec_len / MEM_INCR + 1) * MEM_INCR;
if (self->rec != NULL)
PyMem_Free(self->rec);
self->rec = PyMem_New(Py_UCS4, self->rec_size);
}
else {
Py_UCS4* old_rec = self->rec;

self->rec_size = (rec_len / MEM_INCR + 1) * MEM_INCR;
self->rec = PyMem_Resize(old_rec, Py_UCS4, self->rec_size);
if (self->rec == NULL)
PyMem_Free(old_rec);
}
if (self->rec == NULL) {
size_t rec_size_new = (size_t)(rec_len / MEM_INCR + 1) * MEM_INCR;
Py_UCS4 *rec_new = self->rec;
PyMem_Resize(rec_new, Py_UCS4, rec_size_new);
if (rec_new == NULL) {
PyErr_NoMemory();
return 0;
}
self->rec = rec_new;
self->rec_size = (Py_ssize_t)rec_size_new;
}
return 1;
}
Expand Down
13 changes: 7 additions & 6 deletions Modules/_pickle.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1380,11 +1380,13 @@ _Unpickler_ResizeMemoList(UnpicklerObject *self, Py_ssize_t new_size)

assert(new_size > self->memo_size);

PyMem_RESIZE(self->memo, PyObject *, new_size);
if (self->memo == NULL) {
PyObject **memo_new = self->memo;
PyMem_RESIZE(memo_new, PyObject *, new_size);
if (memo_new == NULL) {
PyErr_NoMemory();
return -1;
}
self->memo = memo_new;
for (i = self->memo_size; i < new_size; i++)
self->memo[i] = NULL;
self->memo_size = new_size;
Expand Down Expand Up @@ -6297,11 +6299,10 @@ load_mark(UnpicklerObject *self)
return -1;
}

if (self->marks == NULL)
self->marks = PyMem_NEW(Py_ssize_t, alloc);
else
PyMem_RESIZE(self->marks, Py_ssize_t, alloc);
Py_ssize_t *marks_old = self->marks;
PyMem_RESIZE(self->marks, Py_ssize_t, alloc);
if (self->marks == NULL) {
PyMem_FREE(marks_old);
self->marks_size = 0;
PyErr_NoMemory();
return -1;
Expand Down