system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-09-22 20:37:18 +00:00
Code Issues Packages Projects Releases Wiki Activity

mwl8k: Fixing sta dereference when ieee80211_tx_info->control.sta is NULL

Browse source 
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>
This commit is contained in:
Yogesh Ashok Powar 2011-07-13 17:42:06 +05:30 committed by John W. Linville
parent 5a865bad44
commit 16c929df08
1 changed files with 3 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/net/wireless/mwl8k.c
View file

@ -1891,9 +1891,9 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
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);