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sctp: honor PMTU_DISABLED when handling icmp

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sctp_sendmsg() could trigger PMTU updates even when PMTU_DISABLED was
set, as pmtu_pending could be set unconditionally during icmp handling
if the socket was in use by the application.

This patch fixes it by checking for PMTU_DISABLED when handling such
deferred updates.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner
2018-04-26 16:59:00 -03:00
committed by David S. Miller
parent 6e91b578bf
commit 63d01330aa
1 changed files with 5 additions and 3 deletions
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8
net/sctp/socket.c
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@@ -1893,6 +1893,7 @@ static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
struct sctp_sndrcvinfo *sinfo)
{
struct sock *sk = asoc->base.sk;
struct sctp_sock *sp = sctp_sk(sk);
struct net *net = sock_net(sk);
struct sctp_datamsg *datamsg;
bool wait_connect = false;
@@ -1911,13 +1912,14 @@ static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
goto err;
}
if (sctp_sk(sk)->disable_fragments && msg_len > asoc->frag_point) {
if (sp->disable_fragments && msg_len > asoc->frag_point) {
err = -EMSGSIZE;
goto err;
}
if (asoc->pmtu_pending) {
sctp_assoc_sync_pmtu(asoc);
if (sp->param_flags & SPP_PMTUD_ENABLE)
sctp_assoc_sync_pmtu(asoc);
asoc->pmtu_pending = 0;
}
@@ -1936,7 +1938,7 @@ static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
if (err)
goto err;
if (sctp_sk(sk)->strm_interleave) {
if (sp->strm_interleave) {
timeo = sock_sndtimeo(sk, 0);
err = sctp_wait_for_connect(asoc, &timeo);
if (err)