airo: Buffer overflow

SSID_rid has space for only 3 ssids.
txPowerLevels[i] is read before the bounds check for i

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index c70604f..8ce5e4c 100644 (file)
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -5918,20 +5918,19 @@ static int airo_set_essid(struct net_device *dev,
        readSsidRid(local, &SSID_rid);
 
        /* Check if we asked for `any' */
-       if(dwrq->flags == 0) {
+       if (dwrq->flags == 0) {
                /* Just send an empty SSID list */
                memset(&SSID_rid, 0, sizeof(SSID_rid));
        } else {
-               int     index = (dwrq->flags & IW_ENCODE_INDEX) - 1;
+               unsigned index = (dwrq->flags & IW_ENCODE_INDEX) - 1;
 
                /* Check the size of the string */
-               if(dwrq->length > IW_ESSID_MAX_SIZE) {
+               if (dwrq->length > IW_ESSID_MAX_SIZE)
                        return -E2BIG ;
-               }
+
                /* Check if index is valid */
-               if((index < 0) || (index >= 4)) {
+               if (index >= ARRAY_SIZE(SSID_rid.ssids))
                        return -EINVAL;
-               }
 
                /* Set the SSID */
                memset(SSID_rid.ssids[index].ssid, 0,
@@ -6819,7 +6818,7 @@ static int airo_set_txpow(struct net_device *dev,
                return -EINVAL;
        }
        clear_bit (FLAG_RADIO_OFF, &local->flags);
-       for (i = 0; cap_rid.txPowerLevels[i] && (i < 8); i++)
+       for (i = 0; i < 8 && cap_rid.txPowerLevels[i]; i++)
                if (v == cap_rid.txPowerLevels[i]) {
                        readConfigRid(local, 1);
                        local->config.txPower = v;