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>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index c70604f0329e..8ce5e4cee168 100644
--- 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;