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fixed race condition in return value of netconn_gethostbyname() (and thus also lwip_gethostbyname/_r() and lwip_getaddrinfo())

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Signed-off-by: sg <goldsimon@gmx.de>
This commit is contained in:
Thomas Mueller 2016-12-16 15:44:00 +01:00 committed by sg
parent b5f51dbd0c
commit fcd2daf57c
2 changed files with 8 additions and 3 deletions
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4
CHANGELOG
View File

@ -26,6 +26,10 @@ HISTORY
++ Bugfixes:
2016-12-16: Thomas Mueller
* api_lib.c: fixed race condition in return value of netconn_gethostbyname()
(and thus also lwip_gethostbyname/_r() and lwip_getaddrinfo())
2016-12-15: David van Moolenbroek
* opt.h, tcp: added LWIP_HOOK_TCP_ISN() to implement less predictable initial
sequence numbers (see contrib/addons/tcp_isn for an example implementation)

7
src/api/api_lib.c
View File

@ -932,6 +932,7 @@ netconn_gethostbyname(const char *name, ip_addr_t *addr)
sys_sem_t sem;
#endif /* LWIP_MPU_COMPATIBLE */
err_t err;
err_t cberr;
LWIP_ERROR("netconn_gethostbyname: invalid name", (name != NULL), return ERR_ARG;);
LWIP_ERROR("netconn_gethostbyname: invalid addr", (addr != NULL), return ERR_ARG;);
@ -964,13 +965,13 @@ netconn_gethostbyname(const char *name, ip_addr_t *addr)
}
#endif /* LWIP_NETCONN_SEM_PER_THREAD */
err = tcpip_callback(lwip_netconn_do_gethostbyname, &API_VAR_REF(msg));
if (err != ERR_OK) {
cberr = tcpip_callback(lwip_netconn_do_gethostbyname, &API_VAR_REF(msg));
if (cberr != ERR_OK) {
#if !LWIP_NETCONN_SEM_PER_THREAD
sys_sem_free(API_EXPR_REF(API_VAR_REF(msg).sem));
#endif /* !LWIP_NETCONN_SEM_PER_THREAD */
API_VAR_FREE(MEMP_DNS_API_MSG, msg);
return err;
return cberr;
}
sys_sem_wait(API_EXPR_REF_SEM(API_VAR_REF(msg).sem));
#if !LWIP_NETCONN_SEM_PER_THREAD