[FFmpeg-cvslog] avcodec/ituh263dec: Fix undefined left shift of negative number

[Andreas Rheinhardt]

ffmpeg | branch: release/4.2 | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Sat Sep 28 04:26:07 2019 +0200| [5b26d86cdec8533ec0761253f4971b9773eea266] | committer: Andreas Rheinhardt

avcodec/ituh263dec: Fix undefined left shift of negative number

Fixes ticket #8160.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 324487b596fbcda0a5753c7bb7b2e96e9d512479)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5b26d86cdec8533ec0761253f4971b9773eea266
---

 libavcodec/ituh263dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/ituh263dec.c b/libavcodec/ituh263dec.c
index 6d1d771c16..c1005b0994 100644
--- a/libavcodec/ituh263dec.c
+++ b/libavcodec/ituh263dec.c
@@ -1286,7 +1286,7 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
         for(i=0; i<13; i++){
             for(j=0; j<3; j++){
                 int v= get_bits(&s->gb, 8);
-                v |= get_sbits(&s->gb, 8)<<8;
+                v |= get_sbits(&s->gb, 8) * (1 << 8);
                 av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
             }
             av_log(s->avctx, AV_LOG_DEBUG, "\n");