[FFmpeg-cvslog] avcodec/cngdec: Fix integer clipping

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Thu Nov  2 18:34:09 2017 +0100| [286e3bf17429e3d8eee4fbe36110c9c0764fa74d] | committer: Michael Niedermayer

avcodec/cngdec: Fix integer clipping

Fixes: runtime error: value -36211.7 is outside the range of representable values of type 'short'
Fixes: 2992/clusterfuzz-testcase-6649611793989632

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 51090133b31bc719ea868db15d3ee38e9dbe90f1)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=286e3bf17429e3d8eee4fbe36110c9c0764fa74d
---

 libavcodec/cngdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/cngdec.c b/libavcodec/cngdec.c
index 34f881448d..42ef5bb3db 100644
--- a/libavcodec/cngdec.c
+++ b/libavcodec/cngdec.c
@@ -147,7 +147,7 @@ static int cng_decode_frame(AVCodecContext *avctx, void *data,
         return ret;
     buf_out = (int16_t *)frame->data[0];
     for (i = 0; i < avctx->frame_size; i++)
-        buf_out[i] = p->filter_out[i + p->order];
+        buf_out[i] = av_clip_int16(p->filter_out[i + p->order]);
     memcpy(p->filter_out, p->filter_out + avctx->frame_size,
            p->order * sizeof(*p->filter_out));