linux-kernel - [PATCH 3.2 61/61] mac80211: Fix null dereference in ieee80211_key

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Date:   Wed, 22 Nov 2017 02:11:06 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Johannes Berg" <johannes.berg@...el.com>
Subject: [PATCH 3.2 61/61] mac80211: Fix null dereference in
 ieee80211_key_link()

3.2.96-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben@...adent.org.uk>

Commit ef810e7c3d2a ("mac80211: accept key reinstall without changing
anything") moved the initialisation of key->sdata later in
ieee80211_key_link().  In the upstream commit fdf7cb4185b6 this was
fine, but in this version of the function there is additional code
which relies on key->sdata.  Change this to use the value that will be
(conditionally) assigned to it later.

Cc: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -508,7 +508,7 @@ int ieee80211_key_link(struct ieee80211_
 			 */

 			/* same here, the AP could be using QoS */
-			ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid);
+			ap = sta_info_get(sdata, sdata->u.mgd.bssid);
 			if (ap) {
 				if (test_sta_flag(ap, WLAN_STA_WME))
 					key->conf.flags |=