dm-pcache: clamp the tail kset read to the segment data region

Browse source

The tail-kset read in cache_replay(), the writeback worker and the GC
worker bounds its length by PCACHE_SEG_SIZE - seg_off, the raw segment
size rather than the data region. A tail near the segment end reads past
the segment data into the following control area.

Clamp the read to cache_seg_remain(), the data region.

Fixes: 1d57628ff9 ("dm-pcache: add persistent cache target in device-mapper")
Cc: stable@vger.kernel.org
Signed-off-by: Bryam Vargas <hexlabsecurity@proton.me>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

...

This commit is contained in:

Bryam Vargas 2026-07-17 06:27:01 -05:00 • committed by Mikulas Patocka

parent 97fc4b53db

commit becf07e2b0

3 changed files with 3 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

drivers/md/dm-pcache/cache_gc.c

View file

2

drivers/md/dm-pcache/cache_key.c

View file

2

drivers/md/dm-pcache/cache_writeback.c

View file