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| author | Raymond Hettinger <python@rcn.com> | 2015-09-29 22:45:05 -0700 |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2015-09-29 22:45:05 -0700 |
| commit | db9ecf74f98c73eebe111c51a8a93ca6e70e02d3 (patch) | |
| tree | 66da4d2c086210e6a288fcd827b1a7015818142e /Modules | |
| parent | 309b0bd8454aff1f30e14283a7078dafaf20d8f0 (diff) | |
| download | cpython-db9ecf74f98c73eebe111c51a8a93ca6e70e02d3.tar.gz | |
Add an early-out for deque_clear()
Diffstat (limited to 'Modules')
| -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 5db7aed377..d9df5749e1 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 |