a-lunev commented on a change in pull request #5252:
URL: https://github.com/apache/incubator-nuttx/pull/5252#discussion_r795081288
##########
File path: net/tcp/tcp_send_buffered.c
##########
@@ -355,10 +355,39 @@ static uint16_t psock_send_eventhandler(FAR struct
net_driver_s *dev,
FAR void *pvconn, FAR void *pvpriv,
uint16_t flags)
{
- FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
+ /* FAR struct tcp_conn_s *conn = (FAR struct tcp_conn_s *)pvconn;
+ *
+ * Do not use pvconn argument to get the TCP connection pointer (the above
+ * commented line) because pvconn is normally NULL for some events like
+ * NETDEV_DOWN. Instead, the TCP connection pointer can be reliably
+ * obtained from the corresponding TCP socket.
+ */
+
FAR struct socket *psock = (FAR struct socket *)pvpriv;
+ FAR struct tcp_conn_s *conn;
bool rexmit = false;
+ DEBUGASSERT(psock != NULL);
+
+ /* Get the TCP connection pointer reliably from
+ * the corresponding TCP socket.
+ */
+
+ conn = psock->s_conn;
+ DEBUGASSERT(conn != NULL);
+
+ /* The TCP socket is connected and, hence, should be bound to a device.
+ * Make sure that the polling device is the one that we are bound to.
+ */
+
+ DEBUGASSERT(conn->dev != NULL);
Review comment:
@yamt I have created PR #5373. I have analyzed the source code more and
added some more debug asserts in the suspected places.
CONFIG_DEBUG_ASSERTIONS and CONFIG_DEBUG_NET_ERROR need to be enabled.
BTW the issue is not new. It was mentioned initially in 2015 here:
https://github.com/apache/incubator-nuttx/blob/63071a563a1f7646dab9a6bd718d8b4b550471c4/net/socket/net_monitor.c#L166
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