Commit de908658 authored by Derek Foreman's avatar Derek Foreman Committed by Pekka Paalanen

wayland-server: log an error for events with wrong client objects

Check that all the objects in an event belong to the same client as
the resource posting it.  This prevents a compositor from accidentally
mixing client objects and posting an event that causes a client to
abort with a cryptic message.

Instead the client will now be disconnected as it is when the compositor
tries to send a null for a non-nullable object, and a log message
will be printed by the compositor.
Reviewed-by: default avatarYong Bakos <>
Reviewed-by: default avatarBryce Harrington <>
Signed-off-by: default avatarDerek Foreman <>
Reviewed-by: Pekka Paalanen's avatarPekka Paalanen <>
parent efae9532
......@@ -168,6 +168,36 @@ log_closure(struct wl_resource *resource,
static bool
verify_objects(struct wl_resource *resource, uint32_t opcode,
union wl_argument *args)
struct wl_object *object = &resource->object;
const char *signature = object->interface->events[opcode].signature;
struct argument_details arg;
struct wl_resource *res;
int count, i;
count = arg_count_for_signature(signature);
for (i = 0; i < count; i++) {
signature = get_next_argument(signature, &arg);
switch (arg.type) {
case 'n':
case 'o':
res = (struct wl_resource *) (args[i].o);
if (res && res->client != resource->client) {
wl_log("compositor bug: The compositor "
"tried to use an object from one "
"client in a '%s.%s' for a different "
"client.\n", object->interface->name,
return false;
return true;
static void
handle_array(struct wl_resource *resource, uint32_t opcode,
union wl_argument *args,
......@@ -179,6 +209,11 @@ handle_array(struct wl_resource *resource, uint32_t opcode,
if (resource->client->error)
if (!verify_objects(resource, opcode, args)) {
resource->client->error = 1;
closure = wl_closure_marshal(object, opcode, args,
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