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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
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@ -18,7 +18,7 @@ HISTORY
2015-11-12: Dirk Ziegelmeier 2015-11-12: Dirk Ziegelmeier
* Implement possibility to declare private memory pools. This is useful to * 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) simpler (httpserver_raw)
2015-10-09: Simon Goldschmidt 2015-10-09: Simon Goldschmidt
@ -302,6 +302,11 @@ HISTORY
++ Bugfixes: ++ 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 2013-03-16: Joel Cunningham
* tcp_out.c: reset rto timer on fast retransmission * tcp_out.c: reset rto timer on fast retransmission

15
src/api/api_msg.c
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@ -884,17 +884,13 @@ lwip_netconn_do_close_internal(struct netconn *conn WRITE_DELAYED_PARAM)
#endif /* LWIP_SO_LINGER */ #endif /* LWIP_SO_LINGER */
} else { } else {
if (err == ERR_MEM) { if (err == ERR_MEM) {
/* Closing failed because of memory shortage */ /* Closing failed because of memory shortage, try again later. Even for
if (netconn_is_nonblocking(conn)) { nonblocking netconns, we have to wait since no standard socket application
/* Nonblocking close failed */ is prepared for close failing because of resource shortage.
close_finished = 1; Check the timeout: this is kind of an lwip addition to the standard sockets:
err = ERR_WOULDBLOCK; we wait for some time when failing to allocate a segment for the FIN */
} else {
/* Blocking close, check the timeout */
#if LWIP_SO_SNDTIMEO || LWIP_SO_LINGER #if LWIP_SO_SNDTIMEO || LWIP_SO_LINGER
s32_t close_timeout = LWIP_TCP_CLOSE_TIMEOUT_MS_DEFAULT; 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 */
#if LWIP_SO_SNDTIMEO #if LWIP_SO_SNDTIMEO
if (conn->send_timeout > 0) { if (conn->send_timeout > 0) {
close_timeout = conn->send_timeout; close_timeout = conn->send_timeout;
@ -917,7 +913,6 @@ lwip_netconn_do_close_internal(struct netconn *conn WRITE_DELAYED_PARAM)
err = ERR_OK; err = ERR_OK;
} }
} }
}
} else { } else {
/* Closing failed for a non-memory error: give up */ /* Closing failed for a non-memory error: give up */
close_finished = 1; close_finished = 1;