[FFmpeg-cvslog] avcodec/mpegaudiodec_template: use unsigned shift in handle_crc()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Aug 14 23:30:22 2022 +0200| [7086491fa0eca4ad647b5c9fae6d07344cc44ec0] | committer: Michael Niedermayer

avcodec/mpegaudiodec_template: use unsigned shift in handle_crc()

Fixes: left shift of 192 by 24 places cannot be represented in type 'int'
Fixes: 49577/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MP1FLOAT_fuzzer-5205996678545408

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=7086491fa0eca4ad647b5c9fae6d07344cc44ec0
---

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

diff --git a/libavcodec/mpegaudiodec_template.c b/libavcodec/mpegaudiodec_template.c
index a28cac9867..a711154a3c 100644
--- a/libavcodec/mpegaudiodec_template.c
+++ b/libavcodec/mpegaudiodec_template.c
@@ -374,7 +374,7 @@ static int handle_crc(MPADecodeContext *s, int sec_len)
         crc_val = av_crc(crc_tab, crc_val, &buf[6], sec_byte_len);
 
         AV_WB32(tmp_buf,
-                ((buf[6 + sec_byte_len] & (0xFF00 >> sec_rem_bits)) << 24) +
+                ((buf[6 + sec_byte_len] & (0xFF00U >> sec_rem_bits)) << 24) +
                 ((s->crc << 16) >> sec_rem_bits));
 
         crc_val = av_crc(crc_tab, crc_val, tmp_buf, 3);