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dm-verity-fec: fix the size of dm_verity_fec_io::erasures 

At most 25 entries in dm_verity_fec_io::erasures are used: the maximum
number of FEC roots plus one.  Therefore, set the array size
accordingly.  This reduces the size of dm_verity_fec_io by 912 bytes.

Note: a later commit introduces a constant DM_VERITY_FEC_MAX_ROOTS,
which allows the size to be more clearly expressed as
DM_VERITY_FEC_MAX_ROOTS + 1.  This commit just fixes the size first.

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>
master
Eric Biggers 2026-02-05 20:59:23 -08:00 committed by Mikulas Patocka
parent 48640c88a8
commit a7fca324d7
1 changed files with 2 additions and 1 deletions
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3
drivers/md/dm-verity-fec.h
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@ -47,7 +47,8 @@ struct dm_verity_fec {
/* per-bio data */
struct dm_verity_fec_io {
struct rs_control *rs; /* Reed-Solomon state */
int erasures[DM_VERITY_FEC_MAX_RSN]; /* erasures for decode_rs8 */
/* erasures for decode_rs8 */
int erasures[DM_VERITY_FEC_RSM - DM_VERITY_FEC_MIN_RSN + 1];
u8 *output; /* buffer for corrected output */
unsigned int level; /* recursion level */
unsigned int nbufs; /* number of buffers allocated */