[3.14] gh-149816: Fix UAF in Modules/_pickle.c (GH-150024) - #153719
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(cherry picked from commit d095ceb) Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com> Co-authored-by: Alexey Katsman <alex2007508@gmail.com>
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kumaraditya303
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gh-149816: Fix UAF in Modules/_pickle.c (GH-150024)
Backport note: 3.14's batch_list_exact() has the single-item fast path before the batch loop; main moved it inside the loop, which changes the emitted pickle byte stream (APPEND vs MARK ... APPENDS for a trailing single item). To avoid changing 3.14's pickle output, 3.14's structure was kept and only the fix applied: the borrowed PyList_GET_ITEM() + Py_INCREF() became PyList_GetItemRef(), and the list changed size during iteration RuntimeError check was added after each batch. The upstream regression test (test_pickle_dumps_with_concurrent_list_mutations) tolerates RuntimeError/IndexError and passes unchanged.
(cherry picked from commit d095ceb)
Co-authored-by: Alexey Katsman alex2007508@gmail.com
Co-authored-by: Gregory P. Smith 68491+gpshead@users.noreply.github.com