cifs: force interface update before a fresh session setup

commit d9a6d78 upstream.

During a session reconnect, it is possible that the
server moved to another physical server (happens in case
of Azure files). So at this time, force a query of server
interfaces again (in case of multichannel session), such
that the secondary channels connect to the right
IP addresses (possibly updated now).

Cc: stable@vger.kernel.org
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/smb/client/connect.c

@@ -4205,8 +4205,12 @@ cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
 	is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
 	spin_unlock(&ses->chan_lock);
 
-	if (!is_binding)
+	if (!is_binding) {
 		ses->ses_status = SES_IN_SETUP;
+
+		/* force iface_list refresh */
+		ses->iface_last_update = 0;
+	}
 	spin_unlock(&ses->ses_lock);
 
 	/* update ses ip_addr only for primary chan */