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avcodec/pcm: Check bits_per_coded_sample

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Fixes: shift exponent -2 is negative
Fixes: 17736/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PCM_F16LE_fuzzer-5742815929171968
Fixes: 17998/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PCM_F24LE_fuzzer-5716980383875072

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 2019-09-29 01:22:37 +02:00
parent 6d18b62db9
commit 5de19160a3
1 changed files with 3 additions and 0 deletions
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3
libavcodec/pcm.c
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@ -264,6 +264,9 @@ static av_cold int pcm_decode_init(AVCodecContext *avctx)
break;
case AV_CODEC_ID_PCM_F16LE:
case AV_CODEC_ID_PCM_F24LE:
if (avctx->bits_per_coded_sample < 1 || avctx->bits_per_coded_sample > 24)
return AVERROR_INVALIDDATA;
s->scale = 1. / (1 << (avctx->bits_per_coded_sample - 1));
s->fdsp = avpriv_float_dsp_alloc(0);
if (!s->fdsp)