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don't fail closing a socket/netconn when failing to allocate the FIN segment; blocking the calling thread for a while is better than risking leaking a netconn/socket (see bug #46701)

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Signed-off-by: sg <goldsimon@gmx.de>
This commit is contained in:
Joel Cunningham 2016-03-17 21:00:18 +01:00 committed by sg
parent b24e5cd1c8
commit 93ccba9bcb
2 changed files with 26 additions and 26 deletions
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7
CHANGELOG
View File

@ -18,7 +18,7 @@ HISTORY
2015-11-12: Dirk Ziegelmeier
* Implement possibility to declare private memory pools. This is useful to
decouple some apps from the core (SNMP stack) or make contrib app useage
decouple some apps from the core (SNMP stack) or make contrib app usage
simpler (httpserver_raw)
2015-10-09: Simon Goldschmidt
@ -302,6 +302,11 @@ HISTORY
++ Bugfixes:
2013-03-17: Joel Cunningham
* api_msg.c: don't fail closing a socket/netconn when failing to allocate the
FIN segment; blocking the calling thread for a while is better than risking
leaking a netconn/socket (see bug #46701)
2013-03-16: Joel Cunningham
* tcp_out.c: reset rto timer on fast retransmission

45
src/api/api_msg.c
View File

@ -884,38 +884,33 @@ lwip_netconn_do_close_internal(struct netconn *conn WRITE_DELAYED_PARAM)
#endif /* LWIP_SO_LINGER */
} else {
if (err == ERR_MEM) {
/* Closing failed because of memory shortage */
if (netconn_is_nonblocking(conn)) {
/* Nonblocking close failed */
close_finished = 1;
err = ERR_WOULDBLOCK;
} else {
/* Blocking close, check the timeout */
/* Closing failed because of memory shortage, try again later. Even for
nonblocking netconns, we have to wait since no standard socket application
is prepared for close failing because of resource shortage.
Check the timeout: this is kind of an lwip addition to the standard sockets:
we wait for some time when failing to allocate a segment for the FIN */
#if LWIP_SO_SNDTIMEO || LWIP_SO_LINGER
s32_t close_timeout = LWIP_TCP_CLOSE_TIMEOUT_MS_DEFAULT;
/* this is kind of an lwip addition to the standard sockets: we wait
for some time when failing to allocate a segment for the FIN */
s32_t close_timeout = LWIP_TCP_CLOSE_TIMEOUT_MS_DEFAULT;
#if LWIP_SO_SNDTIMEO
if (conn->send_timeout > 0) {
close_timeout = conn->send_timeout;
}
if (conn->send_timeout > 0) {
close_timeout = conn->send_timeout;
}
#endif /* LWIP_SO_SNDTIMEO */
#if LWIP_SO_LINGER
if (conn->linger >= 0) {
/* use linger timeout (seconds) */
close_timeout = conn->linger * 1000U;
}
if (conn->linger >= 0) {
/* use linger timeout (seconds) */
close_timeout = conn->linger * 1000U;
}
#endif
if ((s32_t)(sys_now() - conn->current_msg->msg.sd.time_started) >= close_timeout) {
if ((s32_t)(sys_now() - conn->current_msg->msg.sd.time_started) >= close_timeout) {
#else /* LWIP_SO_SNDTIMEO || LWIP_SO_LINGER */
if (conn->current_msg->msg.sd.polls_left == 0) {
if (conn->current_msg->msg.sd.polls_left == 0) {
#endif /* LWIP_SO_SNDTIMEO || LWIP_SO_LINGER */
close_finished = 1;
if (close) {
/* in this case, we want to RST the connection */
tcp_abort(tpcb);
err = ERR_OK;
}
close_finished = 1;
if (close) {
/* in this case, we want to RST the connection */
tcp_abort(tpcb);
err = ERR_OK;
}
}
} else {