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@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 4 deletions

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 51c6c672c8aa..0d11f234d615 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) {