[FFmpeg-cvslog] avcodec/pcm: Check bits_per_coded_sample

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Sep 29 01:22:37 2019 +0200| [5de19160a3c0dedb3cefd00e863a8d8f74ca2ad0] | committer: Michael Niedermayer

avcodec/pcm: Check bits_per_coded_sample

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 at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5de19160a3c0dedb3cefd00e863a8d8f74ca2ad0
---

 libavcodec/pcm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/pcm.c b/libavcodec/pcm.c
index 83850cc793..4ce0b9487b 100644
--- a/libavcodec/pcm.c
+++ b/libavcodec/pcm.c
@@ -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)