9p: potential ERR_PTR() dereference

p9_client_walk() can return error values if we run out of space or there
is a problem with the network.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 358563689064df61c9b81713ad8bb8911c6518bd..6406f896bf95fe56d404f40cdae7e083d88e3e9c 100644 (file)
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -242,7 +242,8 @@ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry)
        }
        kfree(wnames);
 fid_out:
-       v9fs_fid_add(dentry, fid);
+       if (!IS_ERR(fid))
+               v9fs_fid_add(dentry, fid);
 err_out:
        up_read(&v9ses->rename_sem);
        return fid;