[FFmpeg-cvslog] avformat/matroskadec: Assert that num_levels is non negative

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Mon Jun  3 01:25:59 2024 +0200| [316bd5787b18b36aceb11ae7ec2f2139d696e42e] | committer: Michael Niedermayer

avformat/matroskadec: Assert that num_levels is non negative

Maybe Closes: CID1452496 Uninitialized scalar variable

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 019fce18bb0628ac8bc47a81d647a23d604b6123)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=316bd5787b18b36aceb11ae7ec2f2139d696e42e
---

 libavformat/matroskadec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index ac2f0cd7c7..5e461c0d68 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -3704,7 +3704,7 @@ static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
     MatroskaBlock     *block = &cluster->block;
     int res;
 
-    av_assert0(matroska->num_levels <= 2);
+    av_assert0(matroska->num_levels <= 2U);
 
     if (matroska->num_levels == 1) {
         res = ebml_parse(matroska, matroska_segment, NULL);