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avformat/wtvdec: Skip too big tags

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get_tag() is not designed with negative length in mind;
in this case, it will allocate a very small buffer
(LEN_PRETTY_GUID + 1) and might call avio_get_str16le()
with a negative maxlen (which relies on these parameters
to be signed).

Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2023-09-12 11:36:01 +02:00
parent c461ee39f9
commit 197f7e914b
1 changed files with 1 additions and 1 deletions
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2
libavformat/wtvdec.c
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@ -539,7 +539,7 @@ static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
ff_get_guid(pb, &guid); ff_get_guid(pb, &guid);
type = avio_rl32(pb); type = avio_rl32(pb);
length = avio_rl32(pb); length = avio_rl32(pb);
if (!length) if (length <= 0)
break; break;
if (ff_guidcmp(&guid, ff_metadata_guid)) { if (ff_guidcmp(&guid, ff_metadata_guid)) {
av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; " av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "