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client API: fix memory leak with rejected events

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The event was copied early, and wasn't released if it was rejected
instead of being added to the event queue. Fix by copying the event at a
point when it's certainly added to the event queue.

The dup_event_data() function is merely moved.
This commit is contained in:
wm4 2014-08-31 19:51:41 +02:00
parent 866e0e1670
commit f59f1e532e
1 changed files with 74 additions and 73 deletions
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147
player/client.c
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@ -416,76 +416,6 @@ int mpv_initialize(mpv_handle *ctx)
return 0;
}
// Reserve an entry in the ring buffer. This can be used to guarantee that the
// reply can be made, even if the buffer becomes congested _after_ sending
// the request.
// Returns an error code if the buffer is full.
static int reserve_reply(struct mpv_handle *ctx)
{
int res = MPV_ERROR_EVENT_QUEUE_FULL;
pthread_mutex_lock(&ctx->lock);
if (ctx->reserved_events + ctx->num_events < ctx->max_events) {
ctx->reserved_events++;
res = 0;
}
pthread_mutex_unlock(&ctx->lock);
return res;
}
static int append_event(struct mpv_handle *ctx, struct mpv_event *event)
{
if (ctx->num_events + ctx->reserved_events >= ctx->max_events)
return -1;
ctx->events[(ctx->first_event + ctx->num_events) % ctx->max_events] = *event;
ctx->num_events++;
wakeup_client(ctx);
return 0;
}
static int send_event(struct mpv_handle *ctx, struct mpv_event *event)
{
pthread_mutex_lock(&ctx->lock);
uint64_t mask = 1ULL << event->event_id;
if (ctx->property_event_masks & mask)
notify_property_events(ctx, mask);
if (!(ctx->event_mask & mask)) {
pthread_mutex_unlock(&ctx->lock);
return 0;
}
int r = append_event(ctx, event);
if (r < 0 && !ctx->choke_warning) {
mp_err(ctx->log, "Too many events queued.\n");
ctx->choke_warning = true;
}
pthread_mutex_unlock(&ctx->lock);
return r;
}
// Send a reply; the reply must have been previously reserved with
// reserve_reply (otherwise, use send_event()).
static void send_reply(struct mpv_handle *ctx, uint64_t userdata,
struct mpv_event *event)
{
event->reply_userdata = userdata;
pthread_mutex_lock(&ctx->lock);
// If this fails, reserve_reply() probably wasn't called.
assert(ctx->reserved_events > 0);
ctx->reserved_events--;
if (append_event(ctx, event) < 0)
abort();
pthread_mutex_unlock(&ctx->lock);
}
static void status_reply(struct mpv_handle *ctx, int event,
uint64_t userdata, int status)
{
struct mpv_event reply = {
.event_id = event,
.error = status,
};
send_reply(ctx, userdata, &reply);
}
// set ev->data to a new copy of the original data
// (done only for message types that are broadcast)
static void dup_event_data(struct mpv_event *ev)
@ -512,6 +442,78 @@ static void dup_event_data(struct mpv_event *ev)
}
}
// Reserve an entry in the ring buffer. This can be used to guarantee that the
// reply can be made, even if the buffer becomes congested _after_ sending
// the request.
// Returns an error code if the buffer is full.
static int reserve_reply(struct mpv_handle *ctx)
{
int res = MPV_ERROR_EVENT_QUEUE_FULL;
pthread_mutex_lock(&ctx->lock);
if (ctx->reserved_events + ctx->num_events < ctx->max_events) {
ctx->reserved_events++;
res = 0;
}
pthread_mutex_unlock(&ctx->lock);
return res;
}
static int append_event(struct mpv_handle *ctx, struct mpv_event event, bool copy)
{
if (ctx->num_events + ctx->reserved_events >= ctx->max_events)
return -1;
if (copy)
dup_event_data(&event);
ctx->events[(ctx->first_event + ctx->num_events) % ctx->max_events] = event;
ctx->num_events++;
wakeup_client(ctx);
return 0;
}
static int send_event(struct mpv_handle *ctx, struct mpv_event *event, bool copy)
{
pthread_mutex_lock(&ctx->lock);
uint64_t mask = 1ULL << event->event_id;
if (ctx->property_event_masks & mask)
notify_property_events(ctx, mask);
if (!(ctx->event_mask & mask)) {
pthread_mutex_unlock(&ctx->lock);
return 0;
}
int r = append_event(ctx, *event, copy);
if (r < 0 && !ctx->choke_warning) {
mp_err(ctx->log, "Too many events queued.\n");
ctx->choke_warning = true;
}
pthread_mutex_unlock(&ctx->lock);
return r;
}
// Send a reply; the reply must have been previously reserved with
// reserve_reply (otherwise, use send_event()).
static void send_reply(struct mpv_handle *ctx, uint64_t userdata,
struct mpv_event *event)
{
event->reply_userdata = userdata;
pthread_mutex_lock(&ctx->lock);
// If this fails, reserve_reply() probably wasn't called.
assert(ctx->reserved_events > 0);
ctx->reserved_events--;
if (append_event(ctx, *event, false) < 0)
abort(); // not reached
pthread_mutex_unlock(&ctx->lock);
}
static void status_reply(struct mpv_handle *ctx, int event,
uint64_t userdata, int status)
{
struct mpv_event reply = {
.event_id = event,
.error = status,
};
send_reply(ctx, userdata, &reply);
}
// Return whether there's any client listening to this event.
// If false is returned, the core doesn't need to send it.
bool mp_client_event_is_registered(struct MPContext *mpctx, int event)
@ -546,8 +548,7 @@ void mp_client_broadcast_event(struct MPContext *mpctx, int event, void *data)
.event_id = event,
.data = data,
};
dup_event_data(&event_data);
send_event(clients->clients[n], &event_data);
send_event(clients->clients[n], &event_data, true);
}
pthread_mutex_unlock(&clients->lock);
@ -568,7 +569,7 @@ int mp_client_send_event(struct MPContext *mpctx, const char *client_name,
struct mpv_handle *ctx = find_client(clients, client_name);
if (ctx) {
r = send_event(ctx, &event_data);
r = send_event(ctx, &event_data, false);
} else {
r = -1;
talloc_free(data);