[PATCH] PATCH 2/7: knfsd cleanup - FAT shouldn't return NULL

Stop fat_fh_to_dentry returning NULL

the fh_to_dentry routines should never return NULL.
The caller expects an ERR_PTR or a valid (possibly negative)
dentry.  fat did the wrong thing and so could oops.

fs/fat/inode.c

@@ -430,12 +430,13 @@ struct dentry *fat_fh_to_dentry(struct super_block *sb, __u32 *fh,
 	struct dentry *result;
 
 	if (fhtype != 3)
-		return NULL;
+		return ERR_PTR(-ESTALE);
 	if (len < 5)
-		return NULL;
-	if (parent)
-		return NULL; /* We cannot find the parent,
+		return ERR_PTR(-ESTALE);
+	/* We cannot find the parent,
 	   It better just *be* there */
+	if (parent)
+		return ERR_PTR(-ESTALE);
 
 	inode = iget(sb, fh[0]);
 	if (!inode || is_bad_inode(inode) ||