From: Theodore Ts'o Date: Wed, 15 Feb 2017 06:26:39 +0000 (-0500) Subject: ext4: fix fencepost in s_first_meta_bg validation X-Git-Tag: v4.14-rc1~1486^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2ba3e6e8afc9b6188b471f27cf2b5e3cf34e7af2;p=platform%2Fkernel%2Flinux-rpi.git ext4: fix fencepost in s_first_meta_bg validation It is OK for s_first_meta_bg to be equal to the number of block group descriptor blocks. (It rarely happens, but it shouldn't cause any problems.) https://bugzilla.kernel.org/show_bug.cgi?id=194567 Fixes: 3a4b77cd47bb837b8557595ec7425f281f2ca1fe Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org --- diff --git a/fs/ext4/super.c b/fs/ext4/super.c index dde14a7..a673558 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3860,7 +3860,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb); if (ext4_has_feature_meta_bg(sb)) { - if (le32_to_cpu(es->s_first_meta_bg) >= db_count) { + if (le32_to_cpu(es->s_first_meta_bg) > db_count) { ext4_msg(sb, KERN_WARNING, "first meta block group too large: %u " "(group descriptor block count %u)",