Thanks to visit codestin.com
Credit goes to github.com

Skip to content

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

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
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

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
51 changes: 15 additions & 36 deletions Modules/_csv.c
View file
Open in desktop
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
View file
Open in desktop
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