Return-path: Received: from sitav-80046.hsr.ch ([152.96.80.46]:58682 "EHLO mail.strongswan.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751849AbcEMKmE (ORCPT ); Fri, 13 May 2016 06:42:04 -0400 From: Martin Willi To: Johannes Berg Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH] mac80211_hwsim: Add missing check for HWSIM_ATTR_SIGNAL Date: Fri, 13 May 2016 12:41:48 +0200 Message-Id: <1463136108-4434-1-git-send-email-martin@strongswan.org> (sfid-20160513_124209_190429_B7FDC681) Sender: linux-wireless-owner@vger.kernel.org List-ID: A wmediumd that does not send this attribute causes a NULL pointer dereference, as the attribute is accessed even if it does not exist. The attribute was required but never checked ever since userspace frame forwarding has been introduced. The issue gets more problematic once we allow wmediumd registration from user namespaces. Fixes: 7882513bacb1 ("mac80211_hwsimdriver support userspace frame tx/rx") Signed-off-by: Martin Willi --- drivers/net/wireless/mac80211_hwsim.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index 303d94d..a16cd0c 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -2817,6 +2817,7 @@ static int hwsim_tx_info_frame_received_nl(struct sk_buff *skb_2, if (!info->attrs[HWSIM_ATTR_ADDR_TRANSMITTER] || !info->attrs[HWSIM_ATTR_FLAGS] || !info->attrs[HWSIM_ATTR_COOKIE] || + !info->attrs[HWSIM_ATTR_SIGNAL] || !info->attrs[HWSIM_ATTR_TX_INFO]) goto out; -- 2.7.4