ovl: copy new uid/gid into overlayfs runtime inode

Overlayfs must update uid/gid after chown, otherwise functions
like inode_owner_or_capable() will check user against stale uid.
Catched by xfstests generic/087, it chowns file and calls utimes.

Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: <stable@vger.kernel.org>

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 49e204560655a8f1737a2a03a38b7a88604a5a4c..a4ff5d0d7db91605880b4eb350ea37aa397c9c9d 100644 (file)
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -65,6 +65,8 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr)
 
                inode_lock(upperdentry->d_inode);
                err = notify_change(upperdentry, attr, NULL);
+               if (!err)
+                       ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
                inode_unlock(upperdentry->d_inode);
        }
        ovl_drop_write(dentry);