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fixed race conditions in assigning netconn->last_err (fixed bugs #38121 and #37676)

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This commit is contained in:
sg 2015-03-19 21:20:29 +01:00
parent 0e919d25e9
commit 9eb900c448
5 changed files with 22 additions and 21 deletions
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4
CHANGELOG
View File

@ -216,6 +216,10 @@ HISTORY
++ Bugfixes:
2015-03-19: Simon Goldschmidt
* api.h, tcpip.h, api_lib.c, api_msg.c: fixed race conditions in assigning
netconn->last_err (fixed bugs #38121 and #37676)
2015-03-09: Simon Goldschmidt
* ip4.c: fixed the IPv4 part of bug #43904 (ip_route() must detect linkup status)

15
src/api/api_lib.c
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@ -181,7 +181,6 @@ netconn_getaddr(struct netconn *conn, ip_addr_t *addr, u16_t *port, u8_t local)
#endif /* LWIP_MPU_COMPATIBLE */
API_MSG_VAR_FREE(msg);
NETCONN_SET_SAFE_ERR(conn, err);
return err;
}
@ -215,7 +214,6 @@ netconn_bind(struct netconn *conn, const ip_addr_t *addr, u16_t port)
TCPIP_APIMSG(&API_MSG_VAR_REF(msg), lwip_netconn_do_bind, err);
API_MSG_VAR_FREE(msg);
NETCONN_SET_SAFE_ERR(conn, err);
return err;
}
@ -247,7 +245,6 @@ netconn_connect(struct netconn *conn, const ip_addr_t *addr, u16_t port)
TCPIP_APIMSG(&API_MSG_VAR_REF(msg), lwip_netconn_do_connect, err);
API_MSG_VAR_FREE(msg);
NETCONN_SET_SAFE_ERR(conn, err);
return err;
}
@ -270,7 +267,6 @@ netconn_disconnect(struct netconn *conn)
TCPIP_APIMSG(&API_MSG_VAR_REF(msg), lwip_netconn_do_disconnect, err);
API_MSG_VAR_FREE(msg);
NETCONN_SET_SAFE_ERR(conn, err);
return err;
}
@ -302,7 +298,6 @@ netconn_listen_with_backlog(struct netconn *conn, u8_t backlog)
TCPIP_APIMSG(&API_MSG_VAR_REF(msg), lwip_netconn_do_listen, err);
API_MSG_VAR_FREE(msg);
NETCONN_SET_SAFE_ERR(conn, err);
return err;
#else /* LWIP_TCP */
LWIP_UNUSED_ARG(conn);
@ -343,7 +338,6 @@ netconn_accept(struct netconn *conn, struct netconn **new_conn)
#if LWIP_SO_RCVTIMEO
if (sys_arch_mbox_fetch(&conn->acceptmbox, (void **)&newconn, conn->recv_timeout) == SYS_ARCH_TIMEOUT) {
NETCONN_SET_SAFE_ERR(conn, ERR_TIMEOUT);
return ERR_TIMEOUT;
}
#else
@ -354,6 +348,9 @@ netconn_accept(struct netconn *conn, struct netconn **new_conn)
if (newconn == NULL) {
/* connection has been aborted */
/* in this special case, we set the netconn error from application thread, as
on a ready-to-accept listening netconn, there should not be anything running
in tcpip_thread */
NETCONN_SET_SAFE_ERR(conn, ERR_ABRT);
return ERR_ABRT;
}
@ -422,7 +419,6 @@ netconn_recv_data(struct netconn *conn, void **new_buf)
#if LWIP_SO_RCVTIMEO
if (sys_arch_mbox_fetch(&conn->recvmbox, &buf, conn->recv_timeout) == SYS_ARCH_TIMEOUT) {
NETCONN_SET_SAFE_ERR(conn, ERR_TIMEOUT);
return ERR_TIMEOUT;
}
#else
@ -533,7 +529,6 @@ netconn_recv(struct netconn *conn, struct netbuf **new_buf)
buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
if (buf == NULL) {
NETCONN_SET_SAFE_ERR(conn, ERR_MEM);
return ERR_MEM;
}
@ -639,7 +634,6 @@ netconn_send(struct netconn *conn, struct netbuf *buf)
TCPIP_APIMSG(&API_MSG_VAR_REF(msg), lwip_netconn_do_send, err);
API_MSG_VAR_FREE(msg);
NETCONN_SET_SAFE_ERR(conn, err);
return err;
}
@ -711,7 +705,6 @@ netconn_write_partly(struct netconn *conn, const void *dataptr, size_t size,
}
API_MSG_VAR_FREE(msg);
NETCONN_SET_SAFE_ERR(conn, err);
return err;
}
@ -745,7 +738,6 @@ netconn_close_shutdown(struct netconn *conn, u8_t how)
TCPIP_APIMSG(&API_MSG_VAR_REF(msg), lwip_netconn_do_close, err);
API_MSG_VAR_FREE(msg);
NETCONN_SET_SAFE_ERR(conn, err);
return err;
}
@ -812,7 +804,6 @@ netconn_join_leave_group(struct netconn *conn,
TCPIP_APIMSG(&API_MSG_VAR_REF(msg), lwip_netconn_do_join_leave_group, err);
API_MSG_VAR_FREE(msg);
NETCONN_SET_SAFE_ERR(conn, err);
return err;
}
#endif /* LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) */

12
src/api/api_msg.c
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@ -251,7 +251,9 @@ recv_tcp(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
(data is already ACKed) */
/* don't overwrite fatal errors! */
if (err != ERR_OK) {
NETCONN_SET_SAFE_ERR(conn, err);
}
if (p != NULL) {
len = p->tot_len;
@ -416,6 +418,7 @@ err_tcp(void *arg, err_t err)
LWIP_ASSERT("inavlid op_completed_sem", op_completed_sem != SYS_SEM_NULL);
conn->current_msg = NULL;
/* wake up the waiting task */
NETCONN_SET_SAFE_ERR(conn, err);
sys_sem_signal(op_completed_sem);
}
} else {
@ -934,6 +937,7 @@ lwip_netconn_do_close_internal(struct netconn *conn WRITE_DELAYED_PARAM)
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
}
}
NETCONN_SET_SAFE_ERR(conn, err);
#if LWIP_TCPIP_CORE_LOCKING
if (delayed)
#endif
@ -988,6 +992,7 @@ lwip_netconn_do_delconn(struct api_msg_msg *msg)
msg->conn->current_msg = NULL;
msg->conn->write_offset = 0;
msg->conn->state = NETCONN_NONE;
NETCONN_SET_SAFE_ERR(msg->conn, ERR_CLSD);
sys_sem_signal(op_completed_sem);
}
}
@ -1140,9 +1145,7 @@ lwip_netconn_do_connected(void *arg, struct tcp_pcb *pcb, err_t err)
(!was_blocking && op_completed_sem == NULL));
conn->current_msg = NULL;
conn->state = NETCONN_NONE;
if (!was_blocking) {
NETCONN_SET_SAFE_ERR(conn, ERR_OK);
}
API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
if (was_blocking) {
@ -1539,6 +1542,7 @@ err_mem:
conn->current_msg->err = err;
conn->current_msg = NULL;
conn->state = NETCONN_NONE;
NETCONN_SET_SAFE_ERR(conn, err);
#if LWIP_TCPIP_CORE_LOCKING
if (delayed)
#endif
@ -1704,6 +1708,7 @@ lwip_netconn_do_close(struct api_msg_msg *msg)
msg->conn->current_msg = NULL;
msg->conn->write_offset = 0;
msg->conn->state = NETCONN_NONE;
NETCONN_SET_SAFE_ERR(msg->conn, ERR_CLSD);
sys_sem_signal(op_completed_sem);
} else {
LWIP_ASSERT("msg->msg.sd.shut == NETCONN_SHUT_RD", msg->msg.sd.shut == NETCONN_SHUT_RD);
@ -1742,7 +1747,8 @@ lwip_netconn_do_close(struct api_msg_msg *msg)
{
msg->err = ERR_CONN;
}
sys_sem_signal(LWIP_API_MSG_SEM(msg));
NETCONN_SET_SAFE_ERR(msg->conn, msg->err);
TCPIP_APIMSG_ACK(msg);
}
#if LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD)

4
src/include/lwip/api.h
View File

@ -235,14 +235,14 @@ struct netconn {
}
/** Set conn->last_err to err but don't overwrite fatal errors */
#define NETCONN_SET_SAFE_ERR(conn, err) do { \
#define NETCONN_SET_SAFE_ERR(conn, err) do { if ((conn) != NULL) { \
SYS_ARCH_DECL_PROTECT(lev); \
SYS_ARCH_PROTECT(lev); \
if (!ERR_IS_FATAL((conn)->last_err)) { \
(conn)->last_err = err; \
} \
SYS_ARCH_UNPROTECT(lev); \
} while(0);
}} while(0);
/* Network connection functions: */
#define netconn_new(t) netconn_new_with_proto_and_callback(t, 0, NULL)

4
src/include/lwip/tcpip.h
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@ -81,7 +81,7 @@ extern sys_mutex_t lock_tcpip_core;
TCPIP_APIMSG_NOERR(m,f); \
(e) = (m)->msg.err; \
} while(0)
#define TCPIP_APIMSG_ACK(m)
#define TCPIP_APIMSG_ACK(m) NETCONN_SET_SAFE_ERR((m)->conn, (m)->err)
#define TCPIP_NETIFAPI(m) tcpip_netifapi_lock(m)
#define TCPIP_NETIFAPI_ACK(m)
#define TCPIP_PPPAPI(m) tcpip_pppapi_lock(m)
@ -91,7 +91,7 @@ extern sys_mutex_t lock_tcpip_core;
#define UNLOCK_TCPIP_CORE()
#define TCPIP_APIMSG_NOERR(m,f) do { (m)->function = f; tcpip_apimsg(m); } while(0)
#define TCPIP_APIMSG(m,f,e) do { (m)->function = f; (e) = tcpip_apimsg(m); } while(0)
#define TCPIP_APIMSG_ACK(m) sys_sem_signal(LWIP_API_MSG_SEM(m))
#define TCPIP_APIMSG_ACK(m) do { NETCONN_SET_SAFE_ERR((m)->conn, (m)->err); sys_sem_signal(LWIP_API_MSG_SEM(m)); } while(0)
#define TCPIP_NETIFAPI(m) tcpip_netifapi(m)
#define TCPIP_NETIFAPI_ACK(m) sys_sem_signal(&m->sem)
#define TCPIP_PPPAPI(m) tcpip_pppapi(m)