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gh-145202: Fix segfault in unicodedata.iter_graphemes when cleared by GC#145203
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gourijain029-del wants to merge 1 commit intopython:mainfrom
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gh-145202: Fix segfault in unicodedata.iter_graphemes when cleared by GC#145203gourijain029-del wants to merge 1 commit intopython:mainfrom
gourijain029-del wants to merge 1 commit intopython:mainfrom
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serhiy-storchaka commentedFeb 25, 2026
#145216 is an alternative solution. I do not think we need |
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This PR fixes a segmentation fault in
unicodedata.iter_graphemesand its segment objects, which occurred when the objects were cleared by the garbage collector before being deallocated.In Modules/unicodedata.c, both
GraphemeBreakIteratorandSegmentObjecthavetp_clearimplementations that set their string references to NULL. However, their deallocators were usingPy_DECREFinstead ofPy_XDECREF. This led to a crash if a GC cycle (or interpreter shutdown) cleared the objects before they reached the deallocation path.I've updated GBI_dealloc and Segment_dealloc to use
Py_XDECREFto safely handle these NULL references.Fixesgh-145202.