From 37fcbab61b8ecf75cb5fd81e5809b71c270f9632 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Fri, 9 Oct 2015 13:44:53 -0500 Subject: [PATCH] ipv4: Only compute net once in ip_call_ra_chain ip_call_ra_chain is called early in the forwarding chain from ip_forward and ip_mr_input, which makes skb->dev the correct expression to get the input network device and dev_net(skb->dev) a correct expression for the network namespace the packet is being processed in. Compute the network namespace and store it in a variable to make the code clearer. Signed-off-by: "Eric W. Biederman" Signed-off-by: David S. Miller --- net/ipv4/ip_input.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index 7cc9f7bb7fb7..804b86fd615f 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -157,6 +157,7 @@ bool ip_call_ra_chain(struct sk_buff *skb) u8 protocol = ip_hdr(skb)->protocol; struct sock *last = NULL; struct net_device *dev = skb->dev; + struct net *net = dev_net(dev); for (ra = rcu_dereference(ip_ra_chain); ra; ra = rcu_dereference(ra->next)) { struct sock *sk = ra->sk; @@ -167,7 +168,7 @@ bool ip_call_ra_chain(struct sk_buff *skb) if (sk && inet_sk(sk)->inet_num == protocol && (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dev->ifindex) && - net_eq(sock_net(sk), dev_net(dev))) { + net_eq(sock_net(sk), net)) { if (ip_is_fragment(ip_hdr(skb))) { if (ip_defrag(skb, IP_DEFRAG_CALL_RA_CHAIN)) return true;