1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 5d075b5f70fc..cd99f1a0f59f 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -917,7 +917,8 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                 if (!saddr)
                         saddr = inet->mc_addr;
                 connected = 0;
-        }
+        } else if (!ipc.oif)
+                ipc.oif = inet->uc_index;
 
         if (connected)
                 rt = (struct rtable *)sk_dst_check(sk, 0);