From: Wang Chen <wangchen@cn.fujitsu.com>
Date: Mon, 7 Apr 2008 01:42:07 +0000 (+0800)
Subject: [IPV6]: Check length of optval provided by user in setsockopt().
X-Git-Tag: v2.6.26-rc1~1138^2~123^2~4
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a28398ba6112be28c6a92aacf06aca1979b454b7;p=linux-2.6

[IPV6]: Check length of optval provided by user in setsockopt().

Check length of setsockopt's optval, which provided by user, before copy it
from user space.
For POSIX compliant, return -EINVAL for setsockopt of short lengths.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
---

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index bf96953752..bd3fb129b3 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -449,6 +449,9 @@ done:
 	{
 		struct ipv6_mreq mreq;
 
+		if (optlen < sizeof(struct ipv6_mreq))
+			goto e_inval;
+
 		retv = -EPROTO;
 		if (inet_sk(sk)->is_icsk)
 			break;
@@ -468,7 +471,7 @@ done:
 	{
 		struct ipv6_mreq mreq;
 
-		if (optlen != sizeof(struct ipv6_mreq))
+		if (optlen < sizeof(struct ipv6_mreq))
 			goto e_inval;
 
 		retv = -EFAULT;
@@ -487,6 +490,9 @@ done:
 		struct group_req greq;
 		struct sockaddr_in6 *psin6;
 
+		if (optlen < sizeof(struct group_req))
+			goto e_inval;
+
 		retv = -EFAULT;
 		if (copy_from_user(&greq, optval, sizeof(struct group_req)))
 			break;
@@ -511,7 +517,7 @@ done:
 		struct group_source_req greqs;
 		int omode, add;
 
-		if (optlen != sizeof(struct group_source_req))
+		if (optlen < sizeof(struct group_source_req))
 			goto e_inval;
 		if (copy_from_user(&greqs, optval, sizeof(greqs))) {
 			retv = -EFAULT;