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avformat/voc_packet: Add a basic check on max_size 

Fixes: signed integer overflow: -2147483648 - 4 cannot be represented in type 'int'
Fixes: 28127/clusterfuzz-testcase-minimized-ffmpeg_dem_VOC_fuzzer-4880586455646208

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 52f75181bf)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-12-12 01:24:42 +01:00
parent 1506eb092b
commit 0fb1a9f6ec
1 changed files with 2 additions and 0 deletions
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2
libavformat/voc_packet.c
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@ -44,6 +44,8 @@ ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
AVINDEX_KEYFRAME);
while (!voc->remaining_size) {
if (max_size < 4)
max_size = 0;
type = avio_r8(pb);
if (type == VOC_TYPE_EOF)
return AVERROR_EOF;