[FFmpeg-cvslog] avcodec/utvideoenc: Use unsigned shift to build flags

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Wed Jun 19 23:55:01 2024 +0200| [d91f7ce227f1e5bc4b541776c64989607dd86d4e] | committer: Michael Niedermayer

avcodec/utvideoenc: Use unsigned shift to build flags

Fixes: left shift of 255 by 24 places cannot be represented in type 'int'
Fixes: 69083/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_fuzzer-5608202363273216

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 69e90491f15d8eef643f8dfd1b75805829496678)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d91f7ce227f1e5bc4b541776c64989607dd86d4e
---

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

diff --git a/libavcodec/utvideoenc.c b/libavcodec/utvideoenc.c
index b8e1cc33e5..9a3f714c19 100644
--- a/libavcodec/utvideoenc.c
+++ b/libavcodec/utvideoenc.c
@@ -218,7 +218,7 @@ static av_cold int utvideo_encode_init(AVCodecContext *avctx)
      * - Compression mode (none/huff)
      * And write the flags.
      */
-    c->flags  = (c->slices - 1) << 24;
+    c->flags  = (c->slices - 1U) << 24;
     c->flags |= 0 << 11; // bit field to signal interlaced encoding mode
     c->flags |= c->compression;