[FFmpeg-cvslog] avcodec/hevc/hevcdec: avoid signed shifts with lt_idx_sps

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Jul 19 19:52:35 2024 +0200| [d52fabaec00440a4615814805210e0eaad6ba3cb] | committer: Michael Niedermayer

avcodec/hevc/hevcdec: avoid signed shifts with lt_idx_sps

Fixes: left shift of 1 by 31 places cannot be represented in type 'int'
Fixes: 70122/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5172200613675008

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=d52fabaec00440a4615814805210e0eaad6ba3cb
---

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

diff --git a/libavcodec/hevc/hevcdec.c b/libavcodec/hevc/hevcdec.c
index 6b3cf0fec3..526194eb80 100644
--- a/libavcodec/hevc/hevcdec.c
+++ b/libavcodec/hevc/hevcdec.c
@@ -292,7 +292,7 @@ static int decode_lt_rps(const HEVCSPS *sps, LongTermRPS *rps,
                 lt_idx_sps = get_bits(gb, av_ceil_log2(sps->num_long_term_ref_pics_sps));
 
             rps->poc[i]  = sps->lt_ref_pic_poc_lsb_sps[lt_idx_sps];
-            rps->used[i] = !!(sps->used_by_curr_pic_lt & (1 << lt_idx_sps));
+            rps->used[i] = !!(sps->used_by_curr_pic_lt & (1U << lt_idx_sps));
         } else {
             rps->poc[i]  = get_bits(gb, sps->log2_max_poc_lsb);
             rps->used[i] = get_bits1(gb);