commit a7fca324d7d90f7b139d4d32747c83a629fdb446 upstream.
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: a739ff3f543a ("dm verity: add support for forward error correction")
Cc: [email protected]
Signed-off-by: Eric Biggers <[email protected]>
Signed-off-by: Mikulas Patocka <[email protected]>
---
drivers/md/dm-verity-fec.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-verity-fec.h b/drivers/md/dm-verity-fec.h
index ec37e607cb3f0..90a0af3f35d31 100644
--- a/drivers/md/dm-verity-fec.h
+++ b/drivers/md/dm-verity-fec.h
@@ -50,7 +50,8 @@ 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 *bufs[DM_VERITY_FEC_BUF_MAX]; /* bufs for deinterleaving */
unsigned int nbufs; /* number of buffers allocated */
u8 *output; /* buffer for corrected output */
--
2.55.0
