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avformat/rmdec: Check codec_length without overflow

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Fixes: signed integer overflow: 2147483647 + 64 cannot be represented in type 'int'
Fixes: 30333/clusterfuzz-testcase-minimized-ffmpeg_dem_RM_fuzzer-5175286983426048

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 2021-02-15 20:52:17 +01:00
parent 1d277b92fa
commit d558c9f237
1 changed files with 1 additions and 1 deletions
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libavformat/rmdec.c
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@ -223,7 +223,7 @@ static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
if (version == 5)
avio_r8(pb);
codecdata_length = avio_rb32(pb);
if(codecdata_length + AV_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
if((unsigned)codecdata_length > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE){
av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
return -1;
}