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matroskademux: Skip over laces directly when postprocessing the frame fails

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Otherwise NULL buffers might be handled afterwards.

Thanks to Antonio Morales for finding and reporting the issue.

Fixes GHSL-2024-249
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3865

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8057>
This commit is contained in:
Sebastian Dröge 2024-09-30 19:06:03 +03:00 committed by GStreamer Marge Bot
parent 395f2b3ffd
commit c20eff779d
1 changed files with 12 additions and 0 deletions
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12
subprojects/gst-plugins-good/gst/matroska/matroska-demux.c
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@ -4988,6 +4988,18 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
if (stream->postprocess_frame) {
GST_LOG_OBJECT (demux, "running post process");
ret = stream->postprocess_frame (GST_ELEMENT (demux), stream, &sub);
if (ret != GST_FLOW_OK) {
gst_clear_buffer (&sub);
goto next_lace;
}
if (sub == NULL) {
GST_WARNING_OBJECT (demux,
"Postprocessing buffer with timestamp %" GST_TIME_FORMAT
" for stream %d failed", GST_TIME_ARGS (buffer_timestamp),
stream_num);
goto next_lace;
}
}
/* At this point, we have a sub-buffer pointing at data within a larger