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avformat/rpl: Check the number of streams 

Fixes: out of memory access
Fixes: 27787/clusterfuzz-testcase-minimized-ffmpeg_dem_RPL_fuzzer-4743666463408128.fuzz

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-12-09 00:49:29 +01:00
parent b1bced5433
commit 0677bdb1f5
1 changed files with 3 additions and 0 deletions
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3
libavformat/rpl.c
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@ -253,6 +253,9 @@ static int rpl_read_header(AVFormatContext *s)
error |= read_line(pb, line, sizeof(line));
}
if (s->nb_streams == 0)
return AVERROR_INVALIDDATA;
rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk
if (vst && rpl->frames_per_chunk > 1 && vst->codecpar->codec_tag != 124)
av_log(s, AV_LOG_WARNING,