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Plug a TCP reassembly UMA zone leak introduced in r226113 by only using the

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backup stack queue entry when the zone is exhausted, otherwise we leak a zone
allocation each time we plug a hole in the reassembly queue.

Reported by:	many on freebsd-stable@ (thread: "TCP Reassembly Issues")
Tested by:	many on freebsd-stable@ (thread: "TCP Reassembly Issues")
Reviewed by:	bz (very brief sanity check)
MFC after:	3 days
This commit is contained in:
Lawrence Stewart 2011-11-27 02:32:08 +00:00
parent 03f33e912d
commit a26fef3a21
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=228016
1 changed files with 22 additions and 17 deletions
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39
sys/netinet/tcp_reass.c
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@ -233,23 +233,28 @@ tcp_reass(struct tcpcb *tp, struct tcphdr *th, int *tlenp, struct mbuf *m)
* when the zone is exhausted. Otherwise we may get stuck.
*/
te = uma_zalloc(V_tcp_reass_zone, M_NOWAIT);
if (te == NULL && th->th_seq != tp->rcv_nxt) {
TCPSTAT_INC(tcps_rcvmemdrop);
m_freem(m);
*tlenp = 0;
if ((s = tcp_log_addrs(&tp->t_inpcb->inp_inc, th, NULL, NULL))) {
log(LOG_DEBUG, "%s; %s: global zone limit reached, "
"segment dropped\n", s, __func__);
free(s, M_TCPLOG);
}
return (0);
} else if (th->th_seq == tp->rcv_nxt) {
bzero(&tqs, sizeof(struct tseg_qent));
te = &tqs;
if ((s = tcp_log_addrs(&tp->t_inpcb->inp_inc, th, NULL, NULL))) {
log(LOG_DEBUG, "%s; %s: global zone limit reached, "
"using stack for missing segment\n", s, __func__);
free(s, M_TCPLOG);
if (te == NULL) {
if (th->th_seq != tp->rcv_nxt) {
TCPSTAT_INC(tcps_rcvmemdrop);
m_freem(m);
*tlenp = 0;
if ((s = tcp_log_addrs(&tp->t_inpcb->inp_inc, th, NULL,
NULL))) {
log(LOG_DEBUG, "%s; %s: global zone limit "
"reached, segment dropped\n", s, __func__);
free(s, M_TCPLOG);
}
return (0);
} else {
bzero(&tqs, sizeof(struct tseg_qent));
te = &tqs;
if ((s = tcp_log_addrs(&tp->t_inpcb->inp_inc, th, NULL,
NULL))) {
log(LOG_DEBUG,
"%s; %s: global zone limit reached, using "
"stack for missing segment\n", s, __func__);
free(s, M_TCPLOG);
}
}
}
tp->t_segqlen++;