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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>
This commit is contained in:
Dan Carpenter 2016-05-10 22:20:37 +03:00 committed by Kalle Valo
parent 50d4d8feb9
commit 03ba4a1b71
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/cisco/airo.c
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@ -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;