ipv4: fix multicast losses

Knut Tidemann found that first packet of a multicast flow was not
correctly received, and bisected the regression to commit b23dd4fe42b4
(Make output route lookup return rtable directly.)

Special thanks to Knut, who provided a very nice bug report, including
sample programs to demonstrate the bug.

Reported-and-bisectedby: Knut Tidemann <knut.andre.tidemann@jotron.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 3 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 045f0ec6a4a0..aa13ef105110 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1902,9 +1902,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 
         hash = rt_hash(daddr, saddr, dev->ifindex, rt_genid(dev_net(dev)));
         rth = rt_intern_hash(hash, rth, skb, dev->ifindex);
-        err = 0;
-        if (IS_ERR(rth))
-                err = PTR_ERR(rth);
+        return IS_ERR(rth) ? PTR_ERR(rth) : 0;
 
 e_nobufs:
         return -ENOBUFS;