linux-kernel - [PATCH] mac80211: Fix null pointer dereference with iTXQ support

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Message-Id: <1499472194-9654-1-git-send-email-ch.lee@newracom.com>
Date:   Fri,  7 Jul 2017 17:03:14 -0700
From:   Chunho Lee <handera@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     ch.lee@...racom.com, thomas.kang@...racom.com,
        Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org (open list:MAC80211),
        netdev@...r.kernel.org (open list:NETWORKING [GENERAL]),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] mac80211: Fix null pointer dereference with iTXQ support

This change adds null pointer check before dereferencing pointer dev on
netif_tx_start_all_queues() when an interface is added.
With iTXQ support, netif_tx_start_all_queues() is always called while
an interface is added. however, the netdev queues are not associated
and dev is null when the interface is either NL80211_IFTYPE_P2P_DEVICE
or NL80211_IFTYPE_NAN.

Signed-off-by: Chunho Lee <ch.lee@...racom.com>
---
 net/mac80211/iface.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index f5f5015..e2edd10 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -731,7 +731,8 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 	    local->ops->wake_tx_queue) {
 		/* XXX: for AP_VLAN, actually track AP queues */
-		netif_tx_start_all_queues(dev);
+		if (dev)
+			netif_tx_start_all_queues(dev);
 	} else if (dev) {
 		unsigned long flags;
 		int n_acs = IEEE80211_NUM_ACS;
-- 
2.7.4