[FFmpeg-cvslog] avcodec/av1dec: Check tile_cols

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Feb  1 18:42:34 2022 +0100| [4fdfe430c12225e819f68993474bd2f473c7e8b1] | committer: Michael Niedermayer

avcodec/av1dec: Check tile_cols

Fixes: division by zero
Fixes: 43769/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AV1_fuzzer-5392562205097984
Fixes: 43950/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AV1_fuzzer-5769210217758720

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=4fdfe430c12225e819f68993474bd2f473c7e8b1
---

 libavcodec/av1dec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
index a274d8867e..613efc5d11 100644
--- a/libavcodec/av1dec.c
+++ b/libavcodec/av1dec.c
@@ -398,6 +398,9 @@ static int get_tiles_info(AVCodecContext *avctx, const AV1RawTileGroup *tile_gro
     s->tg_start = tile_group->tg_start;
     s->tg_end = tile_group->tg_end;
 
+    if (s->raw_frame_header->tile_cols == 0)
+        return AVERROR_INVALIDDATA;
+
     for (tile_num = tile_group->tg_start; tile_num <= tile_group->tg_end; tile_num++) {
         tile_row = tile_num / s->raw_frame_header->tile_cols;
         tile_col = tile_num % s->raw_frame_header->tile_cols;