cifs: fix missed refcounting of ipc tcon

commit 65de262a209da0951eb9bc60b3b7faf3bbffa38a upstream.

Fix missed refcounting of IPC tcon used for getting domain-based DFS
root referrals.  We want to keep it alive as long as mount is active
and can be refreshed.  For standalone DFS root referrals it wouldn't
be a problem as the client ends up having an IPC tcon for both mount
and cache.

Fixes: c88f7dcd6d64 ("cifs: support nested dfs links over reconnect")
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 839059b8a9c986fe83a4d403883b33f0e940af11..c6e2a0ff8f0c6621446d71d00ac6f5864db8d3b3 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3390,6 +3390,7 @@ static int connect_dfs_root(struct mount_ctx *mnt_ctx, struct dfs_cache_tgt_list
         */
        mount_put_conns(mnt_ctx);
        mount_get_dfs_conns(mnt_ctx);
+       set_root_ses(mnt_ctx);
 
        full_path = build_unc_path_to_root(ctx, cifs_sb, true);
        if (IS_ERR(full_path))