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pulsesink: in accept_caps() check if ring buffer is NULL before de-referencing

Browse source 
And sprinkle some thread-safety (take object lock for
accessing ring buffer, and pa main loop lock for the
context).

https://bugzilla.gnome.org/show_bug.cgi?id=683782
This commit is contained in:
Tim-Philipp Müller 2012-10-18 11:32:10 +01:00
parent 13328bc129
commit d2fdc26c38
1 changed files with 21 additions and 7 deletions
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28
ext/pulse/pulsesink.c
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@ -1960,9 +1960,7 @@ done:
static gboolean
gst_pulsesink_query_acceptcaps (GstPulseSink * psink, GstCaps * caps)
{
GstPulseRingBuffer *pbuf = GST_PULSERING_BUFFER_CAST (GST_AUDIO_BASE_SINK
(psink)->ringbuffer);
GstPad *pad = GST_BASE_SINK_PAD (psink);
GstPulseRingBuffer *pbuf = NULL;
GstCaps *pad_caps;
GstStructure *st;
gboolean ret = FALSE;
@ -1975,14 +1973,14 @@ gst_pulsesink_query_acceptcaps (GstPulseSink * psink, GstCaps * caps)
pa_format_info *format = NULL, *formats[1];
guint channels;
pad_caps = gst_pad_query_caps (pad, caps);
pad_caps = gst_pad_query_caps (GST_BASE_SINK_PAD (psink), caps);
ret = pad_caps != NULL;
gst_caps_unref (pad_caps);
GST_DEBUG_OBJECT (psink, "caps %" GST_PTR_FORMAT, caps);
/* Either template caps didn't match, or we're still in NULL state */
if (!ret || !pbuf->context)
/* Template caps didn't match */
if (!ret)
goto done;
/* If we've not got fixed caps, creating a stream might fail, so let's just
@ -1990,10 +1988,23 @@ gst_pulsesink_query_acceptcaps (GstPulseSink * psink, GstCaps * caps)
if (!gst_caps_is_fixed (caps))
goto done;
ret = FALSE;
GST_OBJECT_LOCK (psink);
pbuf = GST_PULSERING_BUFFER_CAST (GST_AUDIO_BASE_SINK (psink)->ringbuffer);
if (pbuf != NULL)
gst_object_ref (pbuf);
GST_OBJECT_UNLOCK (psink);
/* We're still in NULL state */
if (pbuf == NULL)
goto done;
pa_threaded_mainloop_lock (mainloop);
if (pbuf->context == NULL)
goto out;
ret = FALSE;
spec.latency_time = GST_AUDIO_BASE_SINK (psink)->latency_time;
if (!gst_audio_ring_buffer_parse_caps (&spec, caps))
goto out;
@ -2077,7 +2088,10 @@ out:
pa_threaded_mainloop_unlock (mainloop);
gst_object_unref (pbuf);
done:
return ret;
info_failed: