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avcodec/utils: Check bitrate for overflow in get_bit_rate() 

Fixes: signed integer overflow: 617890810133996544 * 16 cannot be represented in type 'long'
Fixes: 26565/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-5092054700654592

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 2020-10-25 19:19:54 +01:00
parent 0afbaabdca
commit 8aadae670f
1 changed files with 8 additions and 1 deletions
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9
libavcodec/utils.c
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@ -513,7 +513,14 @@ static int64_t get_bit_rate(AVCodecContext *ctx)
break;
case AVMEDIA_TYPE_AUDIO:
bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
bit_rate = bits_per_sample ? ctx->sample_rate * (int64_t)ctx->channels * bits_per_sample : ctx->bit_rate;
if (bits_per_sample) {
bit_rate = ctx->sample_rate * (int64_t)ctx->channels;
if (bit_rate > INT64_MAX / bits_per_sample) {
bit_rate = 0;
} else
bit_rate *= bits_per_sample;
} else
bit_rate = ctx->bit_rate;
break;
default:
bit_rate = 0;