* [BUG] Recursive locking deadlock in hfsplus
@ 2025-12-01 10:51 Jiakai Xu
0 siblings, 0 replies; only message in thread
From: Jiakai Xu @ 2025-12-01 10:51 UTC (permalink / raw)
To: linux-fsdevel, linux-kernel
Cc: Yangtao Li, John Paul Adrian Glaubitz, Viacheslav Dubeyko,
2200013188
Hi,
I discovered a recursive locking bug in the hfsplus filesystem through fuzzing
and successfully reproduced it on Linux mainline (v6.18).
The issue occurs when hfsplus_file_extend() holds extents_lock while calling
hfsplus_block_allocate(), which may trigger I/O that recursively calls
hfsplus_get_block(), which then tries to acquire the same extents_lock again.
Call chain:
hfsplus_file_extend()
└─ mutex_lock(&hip->extents_lock)
hfsplus_block_allocate()
└─ ...
└─ hfsplus_get_block()
└─ mutex_lock(&hip->extents_lock) ← recursive locking
Details: https://github.com/j1akai/temp/tree/main/20251201
Best regards,
Jiakai Xu
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2025-12-01 10:51 [BUG] Recursive locking deadlock in hfsplus Jiakai Xu
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