Fix off-by-one comparison. The user-supplied value given for the 'write_mostly' argument must be an index starting at 0. The validation of the supplied argument failed to check for 'N' ('>' vs '>='), which would have caused an access beyond the end of the array. Reported-by: Doug Ledford <dledford@xxxxxxxxxx> Signed-off-by: Jonathan Brassow <jbrassow@xxxxxxxxxx> Index: linux-upstream/drivers/md/dm-raid.c =================================================================== --- linux-upstream.orig/drivers/md/dm-raid.c +++ linux-upstream/drivers/md/dm-raid.c @@ -449,7 +449,7 @@ static int parse_raid_params(struct raid rs->ti->error = "write_mostly option is only valid for RAID1"; return -EINVAL; } - if (value > rs->md.raid_disks) { + if (value >= rs->md.raid_disks) { rs->ti->error = "Invalid write_mostly drive index given"; return -EINVAL; } -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel