[3.15] gh-153578: Fix out-of-bounds write in bytearray.extend() with a reentrant __buffer__ (GH-153579) - #156007
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[3.15] gh-153578: Fix out-of-bounds write in bytearray.extend() with a reentrant __buffer__ (GH-153579)#156007miss-islington wants to merge 1 commit into
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… reentrant __buffer__ (pythonGH-153579) bytearray.extend() clamped only the high bound of the append range to the current size after acquiring the argument's buffer, so a __buffer__ that shrinks the bytearray left the low bound past the high bound and ran a negative-size memmove. Clamp the low bound too, matching bytearray.__iadd__. (cherry picked from commit e675e37421357cf0319c5bca2cec533f0909d5b8) Co-authored-by: tonghuaroot (童话) <tonghuaroot@gmail.com>
This was referenced Aug 18, 2026
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bytearray.extend() clamped only the high bound of the append range to the
current size after acquiring the argument's buffer, so a buffer that shrinks
the bytearray left the low bound past the high bound and ran a negative-size
memmove. Clamp the low bound too, matching bytearray.iadd.
(cherry picked from commit e675e37)
Co-authored-by: tonghuaroot (童话) tonghuaroot@gmail.com