ext4: fix fencepost in s_first_meta_bg validation

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: 3a4b77c Signed-off-by: Theodore Ts'o <[email protected]> Cc: [email protected]
open-power · Feb 15, 2017 · 2ba3e6e · 2ba3e6e
1 parent 0d06863
commit 2ba3e6e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
@@ -3860,7 +3860,7 @@ 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_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)",