[FFmpeg-devel] [PATCH 2/2] avcodec/av1dec: Check tile_cols

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 2/2] avcodec/av1dec: Check tile_cols
Date: Tue,  1 Feb 2022 19:52:39 +0100
Message-ID: <20220201185239.13450-2-michael@niedermayer.cc> (raw)
In-Reply-To: <20220201185239.13450-1-michael@niedermayer.cc>

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

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/av1dec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
index 62d459cded..581f22a849 100644
--- a/libavcodec/av1dec.c
+++ b/libavcodec/av1dec.c
@@ -394,6 +394,9 @@ 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;
-- 
2.17.1

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