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avformat/mpc8: Check size before implicitly converting to int 

Fixes: Timeout
Fixes: 28551/clusterfuzz-testcase-minimized-ffmpeg_dem_MPC8_fuzzer-6229183210586112

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-12-24 20:42:27 +01:00
parent ed51890191
commit 78d6d8ddb5
1 changed files with 1 additions and 1 deletions
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2
libavformat/mpc8.c
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@ -292,7 +292,7 @@ static int mpc8_read_packet(AVFormatContext *s, AVPacket *pkt)
return AVERROR_EOF;
mpc8_get_chunk_header(s->pb, &tag, &size);
if (size < 0)
if (size < 0 || size > INT_MAX)
return -1;
if(tag == TAG_AUDIOPACKET){
if ((ret = av_get_packet(s->pb, pkt, size)) < 0)