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ath9k: stop on rates with idx -1 in ath9k rate control's .tx_status 

Rate control algorithms are supposed to stop processing when they
encounter a rate with the index -1.  Checking for rate->count not being
zero is not enough.

Allowing a rate with negative index leads to memory corruption in
ath_debug_stat_rc().

One consequence of the bug is discussed at
https://bugzilla.redhat.com/show_bug.cgi?id=768639

Signed-off-by: Pavel Roskin <proski@gnu.org>
Cc: stable@vger.kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Pavel Roskin 2012-02-11 10:01:53 -05:00 committed by John W. Linville
parent 6670f15b1f
commit 2504a6423b
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/ath/ath9k/rc.c
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@ -1346,7 +1346,7 @@ static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
fc = hdr->frame_control;
for (i = 0; i < sc->hw->max_rates; i++) {
struct ieee80211_tx_rate *rate = &tx_info->status.rates[i];
if (!rate->count)
if (rate->idx < 0 || !rate->count)
break;
final_ts_idx = i;