From f66000f7a39769b0ce2355fca13c40ac2f1c39db Mon Sep 17 00:00:00 2001 From: Jouni Malinen Date: Wed, 17 Dec 2008 13:30:31 +0200 Subject: [PATCH] ath9k: Fix a NULL pointer dereference in ath_rate_get It looks like mac80211 may try to send unicast frames to a STA that does not have a STA entry. We need to make sure that that is caught in the rate control code before dereferencing STA data. Signed-off-by: Jouni Malinen Signed-off-by: John W. Linville --- drivers/net/wireless/ath9k/rc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath9k/rc.c b/drivers/net/wireless/ath9k/rc.c index 0ae5988..04ab457 100644 --- a/drivers/net/wireless/ath9k/rc.c +++ b/drivers/net/wireless/ath9k/rc.c @@ -1498,7 +1498,8 @@ static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, __le16 fc = hdr->frame_control; /* lowest rate for management and multicast/broadcast frames */ - if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) { + if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) || + !sta) { tx_info->control.rates[0].idx = rate_lowest_index(sband, sta); tx_info->control.rates[0].count = is_multicast_ether_addr(hdr->addr1) ? 1 : ATH_MGT_TXMAXTRY; -- 2.7.4