From: Ben Greear <greearb@candelatech.com>
Date: Tue, 7 Dec 2010 05:13:49 +0000 (-0800)
Subject: ath9k: Check for NULL sta in ath_tx_start
X-Git-Tag: firefly_0821_release~7613^2~3122^2~169^2^2~15
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a9927ba3c5f3c5f6b0e8fa7557452335edeaf5fa;p=firefly-linux-kernel-4.4.55.git

ath9k: Check for NULL sta in ath_tx_start

It can be NULL according to docs, and logging showed it
to be NULL in practice.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 16d83d0c0959..bce313e85cff 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1740,7 +1740,10 @@ int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
 	int frmlen = skb->len + FCS_LEN;
 	int q;
 
-	txctl->an = (struct ath_node *)sta->drv_priv;
+	/* NOTE:  sta can be NULL according to net/mac80211.h */
+	if (sta)
+		txctl->an = (struct ath_node *)sta->drv_priv;
+
 	if (info->control.hw_key)
 		frmlen += info->control.hw_key->icv_len;