[FFmpeg-cvslog] avcodec/utils: Check bits_per_coded_sample

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Jun 18 23:55:56 2019 +0200| [d33414d2ad27a5d2193c9ab0948ba7a282c2f910] | committer: Michael Niedermayer

avcodec/utils: Check bits_per_coded_sample

This avoids the need for each decoder separately having to handle this case

Fixes: shift exponent -100663046 is negative
Fixes: out of array access
Fixes: 15270/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5727829913763840

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d33414d2ad27a5d2193c9ab0948ba7a282c2f910
---

 libavcodec/utils.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index cc04b73471..1b1feca38c 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -962,6 +962,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
             ret = AVERROR(EINVAL);
             goto free_and_end;
         }
+        if (avctx->bits_per_coded_sample < 0) {
+            ret = AVERROR(EINVAL);
+            goto free_and_end;
+        }
         if (avctx->sub_charenc) {
             if (avctx->codec_type != AVMEDIA_TYPE_SUBTITLE) {
                 av_log(avctx, AV_LOG_ERROR, "Character encoding is only "