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[3.15] gh-159739: Preserve ctypes base metadata when cloning fails (GH-160174) - #160293
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…thonGH-160174) When creating a ctypes structure subclass, cloning its layout initially copied pointers to buffers owned by the base class. If a later allocation failed, cleaning up the subclass could free those buffers, leaving the base with invalid metadata and potentially causing a crash. Detach the owned pointers until their copies have been allocated. Backport to 3.15 and 3.14. (cherry picked from commit 7c87319) Co-authored-by: Jelle Zijlstra <jelle@openai.com>
This was referenced Oct 22, 2026
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When creating a ctypes structure subclass, cloning its layout initially copied pointers to buffers owned by the base class. If a later allocation failed, cleaning up the subclass could free those buffers, leaving the base with invalid metadata and potentially causing a crash. Detach the owned pointers until their copies have been allocated. Backport to 3.15 and 3.14.
(cherry picked from commit 7c87319)
Co-authored-by: Jelle Zijlstra jelle@openai.com