[3.12] gh-106092: Fix use-after-free crash in frame_dealloc (GH-106875) #107532
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…106875) It was possible for the trashcan to delay the deallocation of a PyFrameObject until after its corresponding _PyInterpreterFrame has already been freed. So frame_dealloc needs to avoid dereferencing the f_frame pointer unless it first checks that the pointer still points to the interpreter frame within the frame object. (cherry picked from commit 557b05c) Co-authored-by: Anders Kaseorg <andersk@mit.edu> Signed-off-by: Anders Kaseorg <andersk@mit.edu>
This was referenced Aug 1, 2023
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It was possible for the trashcan to delay the deallocation of a
PyFrameObject until after its corresponding _PyInterpreterFrame has
already been freed. So frame_dealloc needs to avoid dereferencing the
f_frame pointer unless it first checks that the pointer still points
to the interpreter frame within the frame object.
(cherry picked from commit 557b05c)
Co-authored-by: Anders Kaseorg andersk@mit.edu
Signed-off-by: Anders Kaseorg andersk@mit.edu