ar9170: fix read & write outside array bounds

commit e9d126cdfa60b575f1b5b02024c4faee27dccf07 upstream.

Backport done by Christian Lamparter <chunkeey@googlemail.com>

queue == __AR9170_NUM_TXQ would cause a bug on the next line.

found by Smatch ( http://repo.or.cz/w/smatch.git ).

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/wireless/ar9170/main.c b/drivers/net/wireless/ar9170/main.c
index 5996ff9f7f479e73ba7d53ae2df3961ce83c7c09..f839c83623c25baeb071e6a59b61458d64efacdd 100644 (file)
--- a/drivers/net/wireless/ar9170/main.c
+++ b/drivers/net/wireless/ar9170/main.c
@@ -1486,13 +1486,14 @@ static int ar9170_conf_tx(struct ieee80211_hw *hw, u16 queue,
        int ret;
 
        mutex_lock(&ar->mutex);
-       if ((param) && !(queue > ar->hw->queues)) {
+       if (queue < __AR9170_NUM_TXQ) {
                memcpy(&ar->edcf[ar9170_qos_hwmap[queue]],
                       param, sizeof(*param));
 
                ret = ar9170_set_qos(ar);
-       } else
+       } else {
                ret = -EINVAL;
+       }
 
        mutex_unlock(&ar->mutex);
        return ret;