Commit f66000f7 authored by Jouni Malinen's avatar Jouni Malinen Committed by John W. Linville
Browse files

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: default avatarJouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 91f39e8e

drivers/net/wireless/ath9k/rc.c

+2 −1
Original line number Diff line number Diff line
@@ -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;

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