[FFmpeg-cvslog] avcodec/cbs_h266_syntax_template: Check tile_y

[Michael Niedermayer]

ffmpeg | branch: release/6.1 | Michael Niedermayer <michael at niedermayer.cc> | Thu Mar 21 02:15:16 2024 +0100| [a2ceca5cf6d402ec9d79d415dba116cad8677555] | committer: Michael Niedermayer

avcodec/cbs_h266_syntax_template: Check tile_y

Fixes: out of array access
Fixes: 67021/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4883576579489792

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 57f252b2d10c3dbb422f5ddc4e8625bf56e27a9c)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a2ceca5cf6d402ec9d79d415dba116cad8677555
---

 libavcodec/cbs_h266_syntax_template.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/cbs_h266_syntax_template.c b/libavcodec/cbs_h266_syntax_template.c
index 2c9988341b..439d863b8f 100644
--- a/libavcodec/cbs_h266_syntax_template.c
+++ b/libavcodec/cbs_h266_syntax_template.c
@@ -2072,6 +2072,8 @@ static int FUNC(pps) (CodedBitstreamContext *ctx, RWContext *rw,
 
                 tile_x = tile_idx % current->num_tile_columns;
                 tile_y = tile_idx / current->num_tile_columns;
+                if (tile_y >= current->num_tile_rows)
+                    return AVERROR_INVALIDDATA;
 
                 ctu_x = 0, ctu_y = 0;
                 for (j = 0; j < tile_x; j++) {