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appsrc: Always take the mutex before flushing the queue

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Otherwise the application might push new buffers into the queue while we're
flushing, potentially causing the GQueue data structure to become inconsistent
and causing crashes soon after.

https://bugzilla.gnome.org/show_bug.cgi?id=754597
This commit is contained in:
Sebastian Dröge 2015-09-09 12:33:02 +03:00
parent bbe967a278
commit 8613525301
1 changed files with 9 additions and 0 deletions
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9
gst-libs/gst/app/gstappsrc.c
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@ -561,6 +561,7 @@ gst_app_src_init (GstAppSrc * appsrc)
gst_base_src_set_live (GST_BASE_SRC (appsrc), DEFAULT_PROP_IS_LIVE);
}
/* Must be called with priv->mutex */
static void
gst_app_src_flush_queued (GstAppSrc * src, gboolean retain_last_caps)
{
@ -607,7 +608,10 @@ gst_app_src_dispose (GObject * obj)
priv->notify = NULL;
GST_OBJECT_UNLOCK (appsrc);
g_mutex_lock (&priv->mutex);
gst_app_src_flush_queued (appsrc, FALSE);
g_mutex_unlock (&priv->mutex);
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
@ -767,10 +771,13 @@ static gboolean
gst_app_src_send_event (GstElement * element, GstEvent * event)
{
GstAppSrc *appsrc = GST_APP_SRC_CAST (element);
GstAppSrcPrivate *priv = appsrc->priv;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
g_mutex_lock (&priv->mutex);
gst_app_src_flush_queued (appsrc, TRUE);
g_mutex_unlock (&priv->mutex);
break;
default:
break;
@ -961,7 +968,9 @@ gst_app_src_do_seek (GstBaseSrc * src, GstSegment * segment)
if (res) {
GST_DEBUG_OBJECT (appsrc, "flushing queue");
g_mutex_lock (&priv->mutex);
gst_app_src_flush_queued (appsrc, TRUE);
g_mutex_unlock (&priv->mutex);
priv->is_eos = FALSE;
} else {
GST_WARNING_OBJECT (appsrc, "seek failed");