dm-verity-fec: correctly reject too-small hash devices

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commit 4355142245 upstream.

Fix verity_fec_ctr() to reject too-small hash devices by correctly
taking hash_start into account.

Note that this is necessary because dm-verity doesn't call
dm_bufio_set_sector_offset() on the hash device's bufio client
(v->bufio).  Thus, dm_bufio_get_device_size(v->bufio) returns a size
relative to 0 rather than hash_start.  An alternative fix would be to
call dm_bufio_set_sector_offset() on v->bufio, but then all the code
that reads from the hash device would have to be adjusted accordingly.

Fixes: a739ff3f54 ("dm verity: add support for forward error correction")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Eric Biggers 2026-02-05 20:59:21 -08:00 • committed by Greg Kroah-Hartman

parent d5701717d7

commit b2e681ef7f

1 changed files with 2 additions and 1 deletions

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drivers/md/dm-verity-fec.c

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