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
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index b44dc2874f534c00208631c030f07be61674c55f..ae1d5c49ad072d4897891598e4523f07ae72e727 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3778,7 +3778,7 @@ 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)",