netdev - [patch net-next] net: IP_MULTICAST_IF setsockopt now recognizes struct mreq

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Date:	Fri,  4 May 2012 10:37:45 +0200
From:	Jiri Pirko <jpirko@...hat.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, eric.dumazet@...il.com, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: [patch net-next] net: IP_MULTICAST_IF setsockopt now recognizes struct mreq

Until now, struct mreq has not been recognized and it was worked with
as with struct in_addr. That means imr_multiaddr was copied to
imr_address. So do recognize struct mreq here and copy that correctly.

Signed-off-by: Jiri Pirko <jpirko@...hat.com>
---
 net/ipv4/ip_sockglue.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 51c6c67..0d11f23 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -673,10 +673,15 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 				break;
 		} else {
 			memset(&mreq, 0, sizeof(mreq));
-			if (optlen >= sizeof(struct in_addr) &&
-			    copy_from_user(&mreq.imr_address, optval,
-					   sizeof(struct in_addr)))
-				break;
+			if (optlen >= sizeof(struct ip_mreq)) {
+				if (copy_from_user(&mreq, optval,
+						   sizeof(struct ip_mreq)))
+					break;
+			} else if (optlen >= sizeof(struct in_addr)) {
+				if (copy_from_user(&mreq.imr_address, optval,
+						   sizeof(struct in_addr)))
+					break;
+			}
 		}
 
 		if (!mreq.imr_ifindex) {
-- 
1.7.9.1

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