[FFmpeg-cvslog] avcodec/bethsoftvideo: Check block_type

[Michael Niedermayer]

ffmpeg | branch: release/4.1 | Michael Niedermayer <michael at niedermayer.cc> | Sun Feb 24 23:39:44 2019 +0100| [09683e1f4e215be41afa189c0dd67902a61b70fb] | committer: Michael Niedermayer

avcodec/bethsoftvideo: Check block_type

Fixes: Timeout (17 seconds -> 1 second)
Fixes: 13184/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BETHSOFTVID_fuzzer-5711446296494080

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit b8ecadec0582a1521b5d0d253376966138e6ca78)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=09683e1f4e215be41afa189c0dd67902a61b70fb
---

 libavcodec/bethsoftvideo.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/bethsoftvideo.c b/libavcodec/bethsoftvideo.c
index 274516bf4d..e5a73f55a1 100644
--- a/libavcodec/bethsoftvideo.c
+++ b/libavcodec/bethsoftvideo.c
@@ -109,6 +109,11 @@ static int bethsoftvid_decode_frame(AVCodecContext *avctx,
             if(yoffset >= avctx->height)
                 return AVERROR_INVALIDDATA;
             dst += vid->frame->linesize[0] * yoffset;
+        case VIDEO_P_FRAME:
+        case VIDEO_I_FRAME:
+            break;
+        default:
+            return AVERROR_INVALIDDATA;
     }
 
     // main code