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 3.18-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-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2ba3e6e8afc9b6188b471f27cf2b5e3cf34e7af2 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@xxxxxxx>
Date: Wed, 15 Feb 2017 01:26:39 -0500
Subject: ext4: fix fencepost in s_first_meta_bg validation
From: Theodore Ts'o <tytso@xxxxxxx>
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
Fixes: 3a4b77cd47bb837b8557595ec7425f281f2ca1fe
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Cc: Eryu Guan <guaneryu@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/super.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3932,7 +3932,7 @@ 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_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG)) {
- 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 tytso@xxxxxxx are
queue-3.18/ext4-only-call-ext4_truncate-when-size-isize.patch
queue-3.18/ext4-fix-data-corruption-for-mmap-writes.patch
queue-3.18/ext4-validate-s_first_meta_bg-at-mount-time.patch
queue-3.18/ext4-don-t-clear-sgid-when-inheriting-acls.patch
queue-3.18/ext4-fix-fencepost-in-s_first_meta_bg-validation.patch