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avcodec/mpeg12enc: Use av_rescale() in vbv_buffer_size computation

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Fixes: signed integer overflow: 20 * 2314885530818453759 cannot be represented in type 'long'
Fixes: 69098/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG2VIDEO_fuzzer-6107989688778752

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 0993ef675f06042402a97b08a60155c65dae8ba7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-06-20 00:05:12 +02:00
parent 964a3e2fa7
commit b10323ef64
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1 changed files with 1 additions and 1 deletions
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libavcodec/mpeg12enc.c
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@ -333,7 +333,7 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
else
/* VBV calculation: Scaled so that a VCD has the proper
* VBV size of 40 kilobytes */
vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
vbv_buffer_size = av_rescale_rnd(s->bit_rate, 20, 1151929 / 2, AV_ROUND_ZERO) * 8 * 1024;
vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;
put_sbits(&s->pb, 18, v);