- fixes possible crash when GDB connection is closed while target is running due to log callback sending messages to connection which does not

exist anymore (thanks to Pavel Chromy for this patch)


git-svn-id: svn://svn.berlios.de/openocd/trunk@325 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/server/gdb_server.c

@@ -678,6 +678,7 @@ int gdb_connection_closed(connection_t *connection)
 	}
 
 	target_unregister_event_callback(gdb_target_callback_event_handler, connection);
+	log_setCallback(NULL, NULL);
 
 	return ERROR_OK;
 }

src/server/server.c

@@ -47,7 +47,7 @@ int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char *
 int add_connection(service_t *service, command_context_t *cmd_ctx)
 {
 	unsigned int address_size;
-	connection_t *c, *p;
+	connection_t *c, **p;
 	int retval;
 	
 	c = malloc(sizeof(connection_t));
@@ -73,16 +73,9 @@ int add_connection(service_t *service, command_context_t *cmd_ctx)
 		free(c);
 	}
 	
-	if (service->connections)
-	{
-		for (p = service->connections; p && p->next; p = p->next);
-		if (p)
-			p->next = c;
-	}
-	else
-	{
-		service->connections = c;
-	}
+	/* add to the end of linked list */
+	for (p = &service->connections; *p; p = &(*p)->next);
+	*p = c;
 	
 	service->max_connections--;
 	
@@ -91,30 +84,28 @@ int add_connection(service_t *service, command_context_t *cmd_ctx)
 
 int remove_connection(service_t *service, connection_t *connection)
 {
-	connection_t *c = service->connections;
+	connection_t **p = &service->connections;
+	connection_t *c;
 	
 	/* find connection */
-	while(c)
-	{
-		connection_t *next = c->next;
-		
+	while(c = *p)
+	{		
 		if (c->fd == connection->fd)
 		{	
-			service->connections = next;
 			service->connection_closed(c);
 			close_socket(c->fd);
-			
 			command_done(c->cmd_ctx);
 			
 			/* delete connection */
+			*p = c->next;
 			free(c);
 			
 			service->max_connections++;
 			break;
 		}
 		
-		/* remember the last connection for unlinking */
-		c = next;
+		/* redirect p to next list pointer */
+		p = &(*p)->next;		
 	}
 	
 	return ERROR_OK;
@@ -122,7 +113,7 @@ int remove_connection(service_t *service, connection_t *connection)
 
 int add_service(char *name, enum connection_type type, unsigned short port, int max_connections, new_connection_handler_t new_connection_handler, input_handler_t input_handler, connection_closed_handler_t connection_closed_handler, void *priv)
 {
-	service_t *c, *p;
+	service_t *c, **p;
 	int so_reuseaddr_option = 1;
 	
 	c = malloc(sizeof(service_t));
@@ -166,29 +157,21 @@ int add_service(char *name, enum connection_type type, unsigned short port, int
 		exit(-1);
 	}
 	
-	if (services)
-	{
-		for (p = services; p && p->next; p = p->next);
-		if (p)
-			p->next = c;
-	}
-	else
-	{
-		services = c;
-	}
+	/* add to the end of linked list */
+	for (p = &services; *p; p = &(*p)->next);
+	*p = c;
 	
 	return ERROR_OK;
 }
 
 int remove_service(unsigned short port)
 {
-	service_t *c = services;
+	service_t **p = services;
+	service_t *c;
 	
 	/* find service */
-	while(c)
-	{
-		service_t *next = c->next;
-		
+	while(c = *p)
+	{		
 		if (c->port == port)
 		{	
 			if (c->name)
@@ -198,11 +181,12 @@ int remove_service(unsigned short port)
 				free(c->priv);
 			
 			/* delete service */
+			*p = c->next;
 			free(c);
 		}
-		
-		/* remember the last service for unlinking */
-		c = next;
+
+		/* redirect p to next list pointer */
+		p = &(*p)->next;
 	}
 	
 	return ERROR_OK;