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demux_mkv: don't return null bstr with size specified 

Such bstr object are not valid. Also reject empty blocks.

Found by fuzzing.
This commit is contained in:
Kacper Michajłow 2024-01-28 04:21:12 +01:00 committed by Dudemanguy
parent 5e54a871c5
commit f413e38e42
1 changed files with 6 additions and 0 deletions
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6
demux/demux_mkv.c
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@ -406,6 +406,8 @@ static bstr demux_mkv_decode(struct mp_log *log, mkv_track_t *track,
talloc_free(src);
if (!size)
dest = NULL;
if (!dest)
size = 0;
return (bstr){dest, size};
}
@ -2072,6 +2074,8 @@ static void probe_x264_garbage(demuxer_t *demuxer)
bstr sblock = {block->laces[0]->data, block->laces[0]->size};
bstr nblock = demux_mkv_decode(demuxer->log, track, sblock, 1);
if (!nblock.len)
continue;
sh->codec->first_packet = new_demux_packet_from(nblock.start, nblock.len);
talloc_steal(mkv_d, sh->codec->first_packet);
@ -2834,6 +2838,8 @@ static int handle_block(demuxer_t *demuxer, struct block_info *block_info)
bstr block = {data->data, data->size};
bstr nblock = demux_mkv_decode(demuxer->log, track, block, 1);
if (!nblock.len)
break;
if (block.start != nblock.start || block.len != nblock.len) {
// (avoidable copy of the entire data)