fix-fencepost-in-s_first_meta_bg-validation

   1 ext4: fix fencepost in s_first_meta_bg validation
   2
   3 It is OK for s_first_meta_bg to be equal to the number of block group
   4 descriptor blocks.  (It rarely happens, but it shouldn't cause any
   5 problems.)
   6
   7 https://bugzilla.kernel.org/show_bug.cgi?id=194567
   8
   9 Fixes: 3a4b77cd47bb837b8557595ec7425f281f2ca1fe
  10 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
  11 Cc: stable@vger.kernel.org
  12 diff --git a/fs/ext4/super.c b/fs/ext4/super.c
  13 index dde14a7ac6d7..a673558fe5f8 100644
  14 --- a/fs/ext4/super.c
  15 +++ b/fs/ext4/super.c
  16 @@ -3860,7 +3860,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
  17         db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
  18                    EXT4_DESC_PER_BLOCK(sb);
  19         if (ext4_has_feature_meta_bg(sb)) {
  20 -               if (le32_to_cpu(es->s_first_meta_bg) >= db_count) {
  21 +               if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
  22                         ext4_msg(sb, KERN_WARNING,
  23                                  "first meta block group too large: %u "
  24                                  "(group descriptor block count %u)",