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chardev-socket: do not blindly reset handlers when switching GMainContext 

If the socket is connecting or connected, tcp_chr_update_read_handler will
be called but it should not set the NetListener's callbacks again.
Otherwise, tcp_chr_accept is invoked while the socket is in connected
state and you get an assertion failure.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-02-20 15:33:27 +01:00
parent 3a75ef6a0f
commit 5b774fe550
2 changed files with 102 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
chardev/char-socket.c
View File

@ -632,7 +632,7 @@ static void tcp_chr_update_read_handler(Chardev *chr)
{
SocketChardev *s = SOCKET_CHARDEV(chr);
if (s->listener) {
if (s->listener && s->state == TCP_CHARDEV_STATE_DISCONNECTED) {
/*
* It's possible that chardev context is changed in
* qemu_chr_be_update_read_handlers(). Reset it for QIO net

102
tests/test-char.c
View File

@ -1003,6 +1003,103 @@ static void char_socket_client_test(gconstpointer opaque)
g_free(optstr);
}
static void
count_closed_event(void *opaque, int event)
{
int *count = opaque;
if (event == CHR_EVENT_CLOSED) {
(*count)++;
}
}
static void
char_socket_discard_read(void *opaque, const uint8_t *buf, int size)
{
}
static void char_socket_server_two_clients_test(gconstpointer opaque)
{
SocketAddress *incoming_addr = (gpointer) opaque;
Chardev *chr;
CharBackend be = {0};
QObject *qaddr;
SocketAddress *addr;
Visitor *v;
char *optstr;
QemuOpts *opts;
QIOChannelSocket *ioc1, *ioc2;
int closed = 0;
g_setenv("QTEST_SILENT_ERRORS", "1", 1);
/*
* We rely on addr containing "nowait", otherwise
* qemu_chr_new() will block until a client connects. We
* can't spawn our client thread though, because until
* qemu_chr_new() returns we don't know what TCP port was
* allocated by the OS
*/
optstr = char_socket_addr_to_opt_str(incoming_addr,
false,
NULL,
true);
opts = qemu_opts_parse_noisily(qemu_find_opts("chardev"),
optstr, true);
g_assert_nonnull(opts);
chr = qemu_chr_new_from_opts(opts, NULL, &error_abort);
qemu_opts_del(opts);
g_assert_nonnull(chr);
g_assert(!object_property_get_bool(OBJECT(chr), "connected", &error_abort));
qaddr = object_property_get_qobject(OBJECT(chr), "addr", &error_abort);
g_assert_nonnull(qaddr);
v = qobject_input_visitor_new(qaddr);
visit_type_SocketAddress(v, "addr", &addr, &error_abort);
visit_free(v);
qobject_unref(qaddr);
qemu_chr_fe_init(&be, chr, &error_abort);
qemu_chr_fe_set_handlers(&be, char_socket_can_read, char_socket_discard_read,
count_closed_event, NULL,
&closed, NULL, true);
ioc1 = qio_channel_socket_new();
qio_channel_socket_connect_sync(ioc1, addr, &error_abort);
qemu_chr_wait_connected(chr, &error_abort);
/* switch the chardev to another context */
GMainContext *ctx = g_main_context_new();
qemu_chr_fe_set_handlers(&be, char_socket_can_read, char_socket_discard_read,
count_closed_event, NULL,
&closed, ctx, true);
/* Start a second connection while the first is still connected.
* It will be placed in the listen() backlog, and connect() will
* succeed immediately.
*/
ioc2 = qio_channel_socket_new();
qio_channel_socket_connect_sync(ioc2, addr, &error_abort);
object_unref(OBJECT(ioc1));
/* The two connections should now be processed serially. */
while (g_main_context_iteration(ctx, TRUE)) {
if (closed == 1 && ioc2) {
object_unref(OBJECT(ioc2));
ioc2 = NULL;
}
if (closed == 2) {
break;
}
}
qapi_free_SocketAddress(addr);
object_unparent(OBJECT(chr));
g_main_context_unref(ctx);
g_free(optstr);
g_unsetenv("QTEST_SILENT_ERRORS");
}
#ifdef HAVE_CHARDEV_SERIAL
static void char_serial_test(void)
@ -1342,12 +1439,15 @@ int main(int argc, char **argv)
SOCKET_SERVER_TEST(tcp, &tcpaddr);
SOCKET_CLIENT_TEST(tcp, &tcpaddr);
g_test_add_data_func("/char/socket/server/two-clients/tcp", &tcpaddr,
char_socket_server_two_clients_test);
#ifndef WIN32
SOCKET_SERVER_TEST(unix, &unixaddr);
SOCKET_CLIENT_TEST(unix, &unixaddr);
g_test_add_data_func("/char/socket/server/two-clients/unix", &unixaddr,
char_socket_server_two_clients_test);
#endif
g_test_add_func("/char/udp", char_udp_test);
#ifdef HAVE_CHARDEV_SERIAL
g_test_add_func("/char/serial", char_serial_test);