From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 18 Oct 2013 09:06:56 +0000 (+0300)
Subject: ax25: cleanup a range test
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=768877537de6b9f7c043b73f82baab4f09ee9799;p=openwrt%2Fstaging%2Fblogic.git

ax25: cleanup a range test

The current test works fine in practice.  The "amount" variable is
actually used as a boolean so negative values or any non-zero values
count as "true".  However since we don't allow numbers greater than one,
let's not allow negative numbers either.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 4b4d2b779ec1..a00123ebb0ae 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1735,7 +1735,7 @@ static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 			res = -EFAULT;
 			break;
 		}
-		if (amount > AX25_NOUID_BLOCK) {
+		if (amount < 0 || amount > AX25_NOUID_BLOCK) {
 			res = -EINVAL;
 			break;
 		}