From: Hannes Frederic Sowa Date: Thu, 19 Dec 2013 11:54:58 +0000 (+0100) Subject: ipv6: move ip6_sk_accept_pmtu from generic pmtu update path to ipv6 one X-Git-Url: http://pileus.org/git/?p=~andy%2Flinux;a=commitdiff_plain;h=790e38bc26c4db72a1905c51daaa502e48081616 ipv6: move ip6_sk_accept_pmtu from generic pmtu update path to ipv6 one In commit 93b36cf3425b9b ("ipv6: support IPV6_PMTU_INTERFACE on sockets") I made a horrible mistake to add ip6_sk_accept_pmtu to the generic sctp_icmp_frag_needed path. This results in build warnings if IPv6 is disabled which were luckily caught by Fengguang's kbuild bot. But it also leads to a kernel panic IPv4 frag-needed packet is received. Reported-by: kbuild test robot Signed-off-by: Hannes Frederic Sowa Acked-by: Daniel Borkmann Signed-off-by: David S. Miller --- diff --git a/net/sctp/input.c b/net/sctp/input.c index 042ec6c9ae2..2a192a7c5d8 100644 --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -389,9 +389,6 @@ void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc, if (!t || (t->pathmtu <= pmtu)) return; - if (!ip6_sk_accept_pmtu(sk)) - return; - if (sock_owned_by_user(sk)) { asoc->pmtu_pending = 1; t->pmtu_pending = 1; diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index 317e13eb2c5..14191ab4165 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -172,7 +172,8 @@ static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, switch (type) { case ICMPV6_PKT_TOOBIG: - sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); + if (ip6_sk_accept_pmtu(sk)) + sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); goto out_unlock; case ICMPV6_PARAMPROB: if (ICMPV6_UNK_NEXTHDR == code) {