From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 10 May 2016 19:20:37 +0000 (+0300)
Subject: airo: prevent potential underflow in airo_set_freq()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=03ba4a1b718e3a018f38f1ee030de4cd052bb3f3;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

airo: prevent potential underflow in airo_set_freq()

I'm not sure if this can underflow but Smatch complains.  It seems
harmless to add a check for negatives.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---

diff --git a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c
index 4bd9e2b97e86..833b46c5ed42 100644
--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -5794,7 +5794,7 @@ static int airo_set_freq(struct net_device *dev,
 		fwrq->m = ieee80211_frequency_to_channel(f);
 	}
 	/* Setting by channel number */
-	if((fwrq->m > 1000) || (fwrq->e > 0))
+	if (fwrq->m < 0 || fwrq->m > 1000 || fwrq->e > 0)
 		rc = -EOPNOTSUPP;
 	else {
 		int channel = fwrq->m;