[PATCH 2/3] fuse: check reserved node ID values

[Miklos Szeredi <miklos@szeredi.hu>]

This patch checks reserved node ID values returned by lookup and
creation operations.  In case one of the reserved values is sent,
return -EIO.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>

Index: linux/fs/fuse/dir.c
===================================================================
--- linux.orig/fs/fuse/dir.c	2005-09-23 14:58:09.000000000 +0200
+++ linux/fs/fuse/dir.c	2005-09-23 15:22:37.000000000 +0200
@@ -96,6 +96,8 @@ static int fuse_lookup_iget(struct inode
 	fuse_lookup_init(req, dir, entry, &outarg);
 	request_send(fc, req);
 	err = req->out.h.error;
+	if (!err && (!outarg.nodeid || outarg.nodeid == FUSE_ROOT_ID))
+		err = -EIO;
 	if (!err) {
 		inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
 				  &outarg.attr);
@@ -152,6 +154,10 @@ static int create_new_entry(struct fuse_
 		fuse_put_request(fc, req);
 		return err;
 	}
+	if (!outarg.nodeid || outarg.nodeid == FUSE_ROOT_ID) {
+		fuse_put_request(fc, req);
+		return -EIO;
+	}
 	inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
 			  &outarg.attr);
 	if (!inode) {
-
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