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sd-event: when an event source fails, don't assume the type of it is still set

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If a callback of an event source returns an error, then the event source
might already be half-destroyed, if the callback dropped all refs.
Hence, don't assume that the type is still valid, and save it before we
issue the callback.
This commit is contained in:
Lennart Poettering 2016-12-23 23:26:15 +01:00
parent 9a1c8f2d24
commit 8f5c235d9e
1 changed files with 6 additions and 1 deletions
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7
src/libsystemd/sd-event/sd-event.c
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@ -2226,11 +2226,16 @@ static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) {
}
static int source_dispatch(sd_event_source *s) {
EventSourceType saved_type;
int r = 0;
assert(s);
assert(s->pending || s->type == SOURCE_EXIT);
/* Save the event source type, here, so that we still know it after the event callback which might invalidate
* the event. */
saved_type = s->type;
if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) {
r = source_set_pending(s, false);
if (r < 0)
@ -2318,7 +2323,7 @@ static int source_dispatch(sd_event_source *s) {
if (r < 0)
log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m",
strna(s->description), event_source_type_to_string(s->type));
strna(s->description), event_source_type_to_string(saved_type));
if (s->n_ref == 0)
source_free(s);