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treed67e4365680e59a6eed1a13847f5fb9e016a7eed
parentdcc51417e5ee71bc1984825c23616030d57b83a4 (diff)
sctp: Drop ICMP packet too big message with MTU larger than current PMTU
If ICMP packet too big message is received with MTU larger than current PMTU, SCTP will still accept this ICMP message and sync the PMTU of assoc with the wrong MTU. Endpoing A Endpoint B (ESTABLISHED) (ESTABLISHED) ICMP ---------> (packet too big, MTU too larger) sync PMTU This patch fixed the problem by drop that ICMP message. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/sctp/input.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sctp/input.c b/net/sctp/input.c
index a49fa80b57b9..bf612d954d41 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -369,7 +369,7 @@ static void sctp_add_backlog(struct sock *sk, struct sk_buff *skb)
369void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc, 369void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
370 struct sctp_transport *t, __u32 pmtu) 370 struct sctp_transport *t, __u32 pmtu)
371{ 371{
372 if (!t || (t->pathmtu == pmtu)) 372 if (!t || (t->pathmtu <= pmtu))
373 return; 373 return;
374 374
375 if (sock_owned_by_user(sk)) { 375 if (sock_owned_by_user(sk)) {