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ext4: fix fencepost in s_first_meta_bg validation 

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
Fixes: ext4: validate s_first_meta_bg at mount time
Change-Id: I401a32cc3fca59e08dd578b0e43c0429e17bd673
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Theodore Ts'o 2017-02-15 01:26:39 -05:00 committed by Luca Stefani
parent 3c1f3051da
commit b964607f1f
1 changed files with 1 additions and 1 deletions
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fs/ext4/super.c
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@ -3805,7 +3805,7 @@ 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_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)",