Subject: [patch] p54: potential signedness issue in p54_parse_rssical()

From: Dan Carpenter <[email-masked]>
Date: Sun, 2 Dec 2012 13:36:09 +0300

"entries" is unsigned here, so it is never less than zero.  In theory,
len could be less than offset so I have added a check for that.

Signed-off-by: Dan Carpenter <[email-masked]>

diff --git a/drivers/net/wireless/p54/eeprom.c b/drivers/net/wireless/p54/eeprom.c
index 1ef1bfe..d43e374 100644
--- a/drivers/net/wireless/p54/eeprom.c
+++ b/drivers/net/wireless/p54/eeprom.c
@@ -541,8 +541,9 @@ static int p54_parse_rssical(struct ieee80211_hw *dev,
 		entries = (len - offset) /
 			sizeof(struct pda_rssi_cal_ext_entry);
 
-		if ((len - offset) % sizeof(struct pda_rssi_cal_ext_entry) ||
-		    entries <= 0) {
+		if (len < offset ||
+		    (len - offset) % sizeof(struct pda_rssi_cal_ext_entry) ||
+		    entries == 0) {
 			wiphy_err(dev->wiphy, "invalid rssi database.\n");
 			goto err_data;
 		}