--- linux-stage.orig/fs/ext4/mmp.c	2015-10-06 08:21:12.013939184 +0530
+++ linux-stage/fs/ext4/mmp.c	2015-10-06 08:20:35.242939292 +0530
@@ -99,8 +99,11 @@ static int read_mmp_block(struct super_b
 
 	mmp = (struct mmp_struct *)((*bh)->b_data);
 	if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC ||
-	    !ext4_mmp_csum_verify(sb, mmp))
+	    !ext4_mmp_csum_verify(sb, mmp)) {
+		brelse(*bh);
+		*bh = NULL;
 		return -EINVAL;
+	}
 
 	return 0;
 }
@@ -219,6 +221,7 @@ static int kmmpd(void *data)
 					     "The filesystem seems to have been"
 					     " multiply mounted.");
 				ext4_error(sb, "abort");
+				put_bh(bh_check);
 				goto failed;
 			}
 			put_bh(bh_check);