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matroska-mux: Fix sparse stream crash

Browse source 
https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/656
introduced an invalid memory access when debug is enabled, by casting
the wrong pointer to a GstCollectPad. Fixing that showed the original
change was incorrect and leads to an infinite loop in the
testsuite. This patch fixes both problems.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/788>
This commit is contained in:
Jan Schmidt 2020-10-27 23:43:49 +11:00
parent e0b708ea4a
commit 0e84f42055
1 changed files with 3 additions and 4 deletions
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7
gst/matroska/matroska-mux.c
View file

@ -2255,8 +2255,6 @@ refuse_caps:
static gboolean
gst_matroska_mux_subtitle_pad_setcaps (GstPad * pad, GstCaps * caps)
{
GstCollectData *data = (GstCollectData *) (pad);
/* There is now (at least) one such alement (kateenc), and I'm going
to handle it here and claim it works when it can be piped back
through GStreamer and VLC */
@ -2265,6 +2263,7 @@ gst_matroska_mux_subtitle_pad_setcaps (GstPad * pad, GstCaps * caps)
GstMatroskaTrackSubtitleContext *scontext;
GstMatroskaMux *mux;
GstMatroskaPad *collect_pad;
GstCollectData *data;
const gchar *mimetype;
GstStructure *structure;
const GValue *value = NULL;
@ -2293,6 +2292,8 @@ gst_matroska_mux_subtitle_pad_setcaps (GstPad * pad, GstCaps * caps)
/* find context */
collect_pad = (GstMatroskaPad *) gst_pad_get_element_private (pad);
g_assert (collect_pad);
data = (GstCollectData *) (collect_pad);
context = collect_pad->track;
g_assert (context);
g_assert (context->type == GST_MATROSKA_TRACK_TYPE_SUBTITLE);
@ -2373,10 +2374,8 @@ gst_matroska_mux_subtitle_pad_setcaps (GstPad * pad, GstCaps * caps)
GST_COLLECT_PADS_STREAM_LOCK (mux->collect);
GST_COLLECT_PADS_STATE_UNSET (data, GST_COLLECT_PADS_STATE_LOCKED);
gst_collect_pads_set_waiting (mux->collect, data, FALSE);
GST_COLLECT_PADS_STATE_SET (data, GST_COLLECT_PADS_STATE_LOCKED);
GST_COLLECT_PADS_STREAM_UNLOCK (mux->collect);
exit:
return ret;