[PATCH] fuse: check reserved node ID values

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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index e79e49b..29f1e9f 100644 (file)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -96,6 +96,8 @@ static int fuse_lookup_iget(struct inode *dir, struct dentry *entry,
        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_conn *fc, struct fuse_req *req,
                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) {