netdev - [PATCH] tcp: '< 0' test on unsigned

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Message-ID: <49AAF989.8070000@gmail.com>
Date:	Sun, 01 Mar 2009 22:09:29 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
CC:	netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] tcp: '< 0' test on unsigned

or should this be fixed, with

        if (!buf || len > x)

if so, what should x be?

This patch wasn't tested in any way.
------------------------------>8-------------8<---------------------------------
len is unsigned, so the '< 0' test won't work.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
diff --git a/net/ipv4/tcp_probe.c b/net/ipv4/tcp_probe.c
index 25524d4..0b9d63f 100644
--- a/net/ipv4/tcp_probe.c
+++ b/net/ipv4/tcp_probe.c
@@ -167,7 +167,7 @@ static ssize_t tcpprobe_read(struct file *file, char __user *buf,
 {
 	int error = 0, cnt = 0;
 
-	if (!buf || len < 0)
+	if (!buf || (ssize_t)len < 0)
 		return -EINVAL;
 
 	while (cnt < len) {
--
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