From a7fca324d7d90f7b139d4d32747c83a629fdb446 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 5 Feb 2026 20:59:23 -0800 Subject: [PATCH] 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: a739ff3f543a ("dm verity: add support for forward error correction") Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers Signed-off-by: Mikulas Patocka --- 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 35d28d9f8a9b..32ca2bfee1db 100644 --- a/drivers/md/dm-verity-fec.h +++ b/drivers/md/dm-verity-fec.h @@ -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 */