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| author | Raymond Hettinger <python@rcn.com> | 2015-09-30 05:45:05 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2015-09-30 05:45:05 (GMT) |
| commit | 38031143fbab6267fe464a1cb39eeb5c68de38f4 (patch) | |
| tree | d4d47291ee5924d9cde2e10c1fafcdf8961fea6e /Modules/_collectionsmodule.c | |
| parent | 17f97166766fd2ebe46df0f9fe9308182d141529 (diff) | |
| download | cpython-38031143fbab6267fe464a1cb39eeb5c68de38f4.zip cpython-38031143fbab6267fe464a1cb39eeb5c68de38f4.tar.gz cpython-38031143fbab6267fe464a1cb39eeb5c68de38f4.tar.bz2 | |
Add an early-out for deque_clear()
Diffstat (limited to 'Modules/_collectionsmodule.c')
| -rw-r--r-- | Modules/_collectionsmodule.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c index 5db7aed..d9df574 100644 --- a/Modules/_collectionsmodule.c +++ b/Modules/_collectionsmodule.c @@ -595,6 +595,9 @@ deque_clear(dequeobject *deque) Py_ssize_t n; PyObject *item; + if (Py_SIZE(deque) == 0) + return; + /* During the process of clearing a deque, decrefs can cause the deque to mutate. To avoid fatal confusion, we have to make the deque empty before clearing the blocks and never refer to |