From: Paulo Alcantara <pc@xxxxxxxxxxxxx> commit 6284e46bdd47743a064fe6ac834a7ac05b1fd206 upstream. Use DFS root session whenever possible to get new DFS referrals otherwise we might end up with an IPC tcon (tcon->ses->tcon_ipc) that doesn't respond to them. It should be safe accessing @ses->dfs_root_ses directly in cifs_inval_name_dfs_link_error() as it has same lifetime as of @tcon. Signed-off-by: Paulo Alcantara (SUSE) <pc@xxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx # 6.2 Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/cifs/misc.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -1364,6 +1364,7 @@ int cifs_inval_name_dfs_link_error(const * removing cached DFS targets that the client would eventually * need during failover. */ + ses = CIFS_DFS_ROOT_SES(ses); if (ses->server->ops->get_dfs_refer && !ses->server->ops->get_dfs_refer(xid, ses, ref_path, &refs, &num_refs, cifs_sb->local_nls,
