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avformat/rmdec: sanity check coded_framesize 

Fixes: signed integer overflow: -14671840 * 8224 cannot be represented in type 'int'
Fixes: 24793/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5101884323659776

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 2020-08-16 18:05:34 +02:00
parent 847dc03787
commit aee8477c6b
1 changed files with 5 additions and 1 deletions
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6
libavformat/rmdec.c
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@ -165,7 +165,11 @@ static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
avio_rb16(pb); /* version2 */
avio_rb32(pb); /* header size */
flavor= avio_rb16(pb); /* add codec info / flavor */
ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
coded_framesize = avio_rb32(pb); /* coded frame size */
if (coded_framesize < 0)
return AVERROR_INVALIDDATA;
ast->coded_framesize = coded_framesize;
avio_rb32(pb); /* ??? */
bytes_per_minute = avio_rb32(pb);
if (version == 4) {