Patch "ext4: fix fencepost in s_first_meta_bg validation" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

ext4: fix fencepost in s_first_meta_bg validation

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ext4-fix-fencepost-in-s_first_meta_bg-validation.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Theodore Ts'o <[email protected]>
Date: Wed, 15 Feb 2017 01:26:39 -0500
Subject: ext4: fix fencepost in s_first_meta_bg validation

From: Theodore Ts'o <[email protected]>

commit 2ba3e6e8afc9b6188b471f27cf2b5e3cf34e7af2 upstream.

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

---
 fs/ext4/super.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -3830,7 +3830,7 @@ static int ext4_fill_super(struct super_
 	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)",

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/ext4-fix-fencepost-in-s_first_meta_bg-validation.patch