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Fix a bug reported by Jonathan Leighton in his web-sctp testing

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at the Univ-of-Del. Basically when a 1-to-1 socket did a
socket/bind/send(data)/close. If the timing was right
we would dereference a socket that is NULL.

MFC after:	1 month
This commit is contained in:
Randall Stewart 2011-02-13 14:48:11 +00:00
parent b10d1d5d60
commit d69e7322cb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=218641
1 changed files with 15 additions and 7 deletions
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22
sys/netinet/sctp_input.c
View File

@ -2865,24 +2865,31 @@ sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
SCTP_SOCKET_UNLOCK(so, 1);
return;
}
#endif
soisconnected(stcb->sctp_socket);
if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
soisconnected(stcb->sctp_socket);
}
#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
SCTP_SOCKET_UNLOCK(so, 1);
#endif
}
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
stcb, net);
/*
* since we did not send a HB make sure we don't double
* things
*/
net->hb_responded = 1;
if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
/*
* We don't need to do the asconf thing, nor hb or
* autoclose if the socket is closed.
*/
goto closed_socket;
}
sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
stcb, net);
if (stcb->asoc.sctp_autoclose_ticks &&
sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
@ -2906,6 +2913,7 @@ sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp,
#endif
}
}
closed_socket:
/* Toss the cookie if I can */
sctp_toss_old_cookies(stcb, asoc);
if (!TAILQ_EMPTY(&asoc->sent_queue)) {