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netdev: Fix re-entrancy bug in netdev_shutdown

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netdev_shutdown calls queue_destroy on the netdev_list, which in turn
calls netdev_free.  netdev_free invokes the watches to notify them about
the netdev being removed.  Those clients, or anything downstream can
still invoke netdev_find.  Unfortunately queue_destroy is not re-entrant
safe, so netdev_find might return stale data.  Fix that by using
l_queue_peek_head / l_queue_pop_head instead.

src/station.c:station_enter_state() Old State: connecting, new state:
connected
^CTerminate
src/netdev.c:netdev_free() Freeing netdev wlan1[6]
src/device.c:device_free()
Removing scan context for wdev 100000001
src/scan.c:scan_context_free() sc: 0x4ae9ca0
src/netdev.c:netdev_free() Freeing netdev wlan0[48]
src/device.c:device_free()
src/station.c:station_free()
src/netconfig.c:netconfig_destroy()
==103174== Invalid read of size 8
==103174==    at 0x467AA9: l_queue_find (queue.c:346)
==103174==    by 0x43ACFF: netconfig_reset (netconfig.c:1027)
==103174==    by 0x43AFFC: netconfig_destroy (netconfig.c:1123)
==103174==    by 0x414379: station_free (station.c:3369)
==103174==    by 0x414379: station_destroy_interface (station.c:3466)
==103174==    by 0x47C80C: interface_instance_free (dbus-service.c:510)
==103174==    by 0x47C80C: _dbus_object_tree_remove_interface
(dbus-service.c:1694)
==103174==    by 0x47C99C: _dbus_object_tree_object_destroy
(dbus-service.c:795)
==103174==    by 0x409A87: netdev_free (netdev.c:770)
==103174==    by 0x4677AE: l_queue_clear (queue.c:107)
==103174==    by 0x4677F8: l_queue_destroy (queue.c:82)
==103174==    by 0x40CDC1: netdev_shutdown (netdev.c:5089)
==103174==    by 0x404736: iwd_shutdown (main.c:78)
==103174==    by 0x404736: iwd_shutdown (main.c:65)
==103174==    by 0x46BD61: handle_callback (signal.c:78)
==103174==    by 0x46BD61: signalfd_read_cb (signal.c:104)
This commit is contained in:
Denis Kenzior 2021-01-29 14:53:00 -06:00
parent bd6d19e084
commit ed0f3e87ca
1 changed files with 8 additions and 1 deletions
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9
src/netdev.c
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@ -5082,12 +5082,19 @@ static void netdev_exit(void)
void netdev_shutdown(void) void netdev_shutdown(void)
{ {
struct netdev *netdev;
if (!rtnl) if (!rtnl)
return; return;
l_queue_foreach(netdev_list, netdev_shutdown_one, NULL); l_queue_foreach(netdev_list, netdev_shutdown_one, NULL);
l_queue_destroy(netdev_list, netdev_free); while ((netdev = l_queue_peek_head(netdev_list))) {
netdev_free(netdev);
l_queue_pop_head(netdev_list);
}
l_queue_destroy(netdev_list, NULL);
netdev_list = NULL; netdev_list = NULL;
} }