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avformat/hcom: check that all extradata bytes were read from the input

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Fixes issue #21493.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2026-01-16 13:14:09 -03:00
parent 3829f4ba6a
commit c1a7c79624
1 changed files with 4 additions and 1 deletions
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libavformat/hcom.c
+4 -1
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@@ -21,6 +21,7 @@
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"
#include "pcm.h"
@@ -73,7 +74,9 @@ static int hcom_read_header(AVFormatContext *s)
return ret;
AV_WB16(st->codecpar->extradata, dict_entries);
AV_WB32(st->codecpar->extradata + 2, compresstype);
avio_read(s->pb, st->codecpar->extradata + 6, dict_entries * 4);
ret = ffio_read_size(s->pb, st->codecpar->extradata + 6, dict_entries * 4);
if (ret < 0)
return ret;
avio_skip(s->pb, 1);
st->codecpar->extradata[dict_entries * 4 + 6] = avio_r8(s->pb);