dm-pcache: bound the logical key offset from persistent memory

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cache_key_decode() takes a key's logical off from the cache device and
later indexes req_key_tree->subtrees[] by it in get_subtree(). An off
past the device forms a subtree pointer outside the array, which
rb_insert() writes through during replay.

Reject a key of zero length, or whose off+len (computed in 64 bits)
exceeds the device size, before it is used.

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>

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

parent 16c3b3a326

commit 97fc4b53db

1 changed files with 9 additions and 0 deletions

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drivers/md/dm-pcache/cache_key.c

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