From: Shan Wei <shanwei@cn.fujitsu.com>
Date: Fri, 5 Nov 2010 01:56:34 +0000 (+0000)
Subject: ipv6: fix overlap check for fragments
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f46421416fb6b91513fb687d6503142cd99034a5;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

ipv6: fix overlap check for fragments

The type of FRAG6_CB(prev)->offset is int, skb->len is *unsigned* int,
and offset is int.

Without this patch, type conversion occurred to this expression, when
(FRAG6_CB(prev)->offset + prev->len) is less than offset.

Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index c7ba3149633f..0f2766453759 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -349,7 +349,7 @@ found:
 
 	/* Check for overlap with preceding fragment. */
 	if (prev &&
-	    (FRAG6_CB(prev)->offset + prev->len) - offset > 0)
+	    (FRAG6_CB(prev)->offset + prev->len) > offset)
 		goto discard_fq;
 
 	/* Look for overlap with succeeding segment. */