mwl8k: Fixing sta dereference when ieee80211_tx_info->control.sta is NULL
Following oops was seen on SMP machine
>BUG: unable to handle kernel NULL pointer dereference at 00000012
>IP: [<f8c56691>] mwl8k_tx+0x20e/0x561 [mwl8k]
>*pde = 00000000
>Oops: 0000 [#1] SMP
>Modules linked in: mwl8k mac80211 cfg80211 [last unloaded: cfg80211]
As ieee80211_tx_info->control.sta may be NULL during ->tx call, avoiding sta
dereference in such scenario with the following patch.
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index aeac3cc..a09b945 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -1891,9 +1891,9 @@
txpriority = index;
- if (ieee80211_is_data_qos(wh->frame_control) &&
- skb->protocol != cpu_to_be16(ETH_P_PAE) &&
- sta->ht_cap.ht_supported && priv->ap_fw) {
+ if (priv->ap_fw && sta && sta->ht_cap.ht_supported
+ && skb->protocol != cpu_to_be16(ETH_P_PAE)
+ && ieee80211_is_data_qos(wh->frame_control)) {
tid = qos & 0xf;
mwl8k_tx_count_packet(sta, tid);
spin_lock(&priv->stream_lock);