[PATCH] freevxfs: fix buffer_head leak

- fix a buffer_head leak in vxfs_getfsh()

- s/SLAB_KERNEL/GFP_KERNEL/

- check sb_bread() return value

- drop pointless buffer-mapped() test.

Signed-off-by: Pekka Enberg <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/freevxfs/vxfs_fshead.c

···
 	struct buffer_head		*bp;
 
 	bp = vxfs_bread(ip, which);
-	if (buffer_mapped(bp)) {
+	if (bp) {
 		struct vxfs_fsh		*fhp;
 
-		if (!(fhp = kmalloc(sizeof(*fhp), SLAB_KERNEL)))
-			return NULL;
+		if (!(fhp = kmalloc(sizeof(*fhp), GFP_KERNEL)))
+			goto out;
 		memcpy(fhp, bp->b_data, sizeof(*fhp));
 
-		brelse(bp);
+		put_bh(bp);
 		return (fhp);
 	}
-
+out:
+	brelse(bp);
 	return NULL;
 }