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authorJouni Malinen <jouni.malinen@atheros.com>2008-12-17 13:30:31 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-12-19 15:23:44 -0500
commitf66000f7a39769b0ce2355fca13c40ac2f1c39db (patch)
tree5c23d21f5d54d90be8545c59f627e2448d3478dd /drivers/net/wireless/ath9k/rc.c
parent91f39e8eea725347b6a82d1e35e512ec8b298b0b (diff)
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 <jouni.malinen@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath9k/rc.c')
-rw-r--r--drivers/net/wireless/ath9k/rc.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/wireless/ath9k/rc.c b/drivers/net/wireless/ath9k/rc.c
index 0ae5988e0b6..04ab457a8fa 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;