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avformat/mlvdec: fail reading a packet with 0 streams 

Fixes: NULL pointer dereference
Fixes: 22604/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5667739074297856.fuzz

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 2020-05-31 14:30:43 +02:00
parent 1ba8484559
commit 5bd5c31087
1 changed files with 5 additions and 1 deletions
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6
libavformat/mlvdec.c
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@ -393,10 +393,14 @@ static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
{
MlvContext *mlv = avctx->priv_data;
AVIOContext *pb;
AVStream *st = avctx->streams[mlv->stream_index];
AVStream *st;
int index, ret;
unsigned int size, space;
if (!avctx->nb_streams)
return AVERROR_EOF;
st = avctx->streams[mlv->stream_index];
if (mlv->pts >= st->duration)
return AVERROR_EOF;