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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>
This commit is contained in:
Jouni Malinen 2008-12-17 13:30:31 +02:00 committed by John W. Linville
parent 91f39e8eea
commit f66000f7a3
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wireless/ath9k/rc.c
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@ -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;