From: Dan Carpenter <dan.carpenter@oracle.com>
To: Christian Lamparter <chunkeey@googlemail.com>
Cc: "John W. Linville" <linville@tuxdriver.com>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] p54: potential signedness issue in p54_parse_rssical()
Date: Sun, 2 Dec 2012 13:36:09 +0300 [thread overview]
Message-ID: <20121202103609.GA16078@elgon.mountain> (raw)
"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 <dan.carpenter@oracle.com>
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;
}
next reply other threads:[~2012-12-02 10:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-02 10:36 Dan Carpenter [this message]
2012-12-02 13:54 ` [patch] p54: potential signedness issue in p54_parse_rssical() Christian Lamparter
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