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ath9k_htc: Add a sanity check in ath9k_htc_ampdu_action()

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Smatch generates a warning here:

    drivers/net/wireless/ath/ath9k/htc_drv_main.c:1688 ath9k_htc_ampdu_action()
    error: buffer overflow 'ista->tid_state' 8 <= 15

I don't know if it's a real bug or not but the other paths through this
function all ensure that "tid" is less than ATH9K_HTC_MAX_TID (8) so
checking here makes things more consistent.

Fixes: fb9987d0f7 ("ath9k_htc: Support for AR9271 chipset.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Dan Carpenter 2017-12-05 17:35:08 +03:00 committed by Kalle Valo
parent 2f3bef4b24
commit 413fd2f5c0
1 changed files with 4 additions and 0 deletions
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4
drivers/net/wireless/ath/ath9k/htc_drv_main.c
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@ -1683,6 +1683,10 @@ static int ath9k_htc_ampdu_action(struct ieee80211_hw *hw,
ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
break;
case IEEE80211_AMPDU_TX_OPERATIONAL:
if (tid >= ATH9K_HTC_MAX_TID) {
ret = -EINVAL;
break;
}
ista = (struct ath9k_htc_sta *) sta->drv_priv;
spin_lock_bh(&priv->tx.tx_lock);
ista->tid_state[tid] = AGGR_OPERATIONAL;