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Commit Graph

Author	SHA1	Message	Date
blawrence-ont	de3c6ec646	Fix use-after-free in mappy (#1345 ) mm_map_aux() takes in \|b._b\| which can end up reallocating \|km\| at the end of mm_map_frag_core(). Since the address of \|km\| is cached before those calls it ends up pointing to freed memory. This can result in a crash as seen in #1183, however it also happens to Just Work most of the time since the new allocation often lands at the same address as the old one. Preloading ASAN or a similar replacement allocator that doesn't have that behaviour results in a reliable crash.	2026-02-13 12:14:56 -05:00
blawrence-ont	f3e59fc2a0	Avoid NULL pointer dereference (#1154 ) If the allocated region is 0 bytes then it's unsafe to dereference it. Fixes #1147.	2024-01-24 12:32:05 -05:00

Author

SHA1

Message

Date

blawrence-ont

de3c6ec646

Fix use-after-free in mappy (#1345 )

mm_map_aux() takes in |b._b| which can end up reallocating |km| at the
end of mm_map_frag_core(). Since the address of |km| is cached before
those calls it ends up pointing to freed memory.

This can result in a crash as seen in #1183, however it also happens to
Just Work most of the time since the new allocation often lands at the
same address as the old one. Preloading ASAN or a similar replacement
allocator that doesn't have that behaviour results in a reliable crash.

2026-02-13 12:14:56 -05:00

blawrence-ont

f3e59fc2a0

Avoid NULL pointer dereference (#1154 )

If the allocated region is 0 bytes then it's unsafe to dereference it.

Fixes #1147.

2024-01-24 12:32:05 -05:00