--- linux-stage.orig/fs/ext4/mmp.c	2015-11-01 15:42:38.069175571 +0530
+++ linux-stage/fs/ext4/mmp.c	2015-11-01 15:46:53.840174791 +0530
@@ -59,8 +59,11 @@
 	}
 
 	mmp = (struct mmp_struct *)((*bh)->b_data);
-	if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC)
+	if (le32_to_cpu(mmp->mmp_magic) != EXT4_MMP_MAGIC) {
+		brelse(*bh);
+		*bh = NULL;
 		return -EINVAL;
+	}
 
 	return 0;
 }
@@ -178,6 +180,7 @@
 					     "The filesystem seems to have been"
 					     " multiply mounted.");
 				ext4_error(sb, "abort");
+				put_bh(bh_check);
 				goto failed;
 			}
 			put_bh(bh_check);