Return correct error on query of xattr on file with empty xattrs

xfstest 020 detected a problem with cifs xattr handling.  When a file
had an empty xattr list, we returned success (with an empty xattr value)
on query of particular xattrs rather than returning ENODATA.
This patch fixes it so that query of an xattr returns ENODATA when the
xattr list is empty for the file.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index f3264bd7a83d..6ce4e0954b98 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -6197,6 +6197,9 @@ QAllEAsRetry:
         cifs_dbg(FYI, "ea length %d\n", list_len);
         if (list_len <= 8) {
                 cifs_dbg(FYI, "empty EA list returned from server\n");
+                /* didn't find the named attribute */
+                if (ea_name)
+                        rc = -ENODATA;
                 goto QAllEAsOut;
         }