[FFmpeg-devel] [PATCH 1/6] avformat/mov: Check tile_item_list

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 1/6] avformat/mov: Check tile_item_list
Date: Fri, 26 Apr 2024 05:08:34 +0200
Message-ID: <20240426030839.3001504-1-michael@niedermayer.cc> (raw)

Fixes: Null pointer dereference
Fixes: 67861/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5352628142800896

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

diff --git a/libavformat/mov.c b/libavformat/mov.c
index ecd29a7d08b..97a24e6737e 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -9289,6 +9289,9 @@ static int read_image_grid(AVFormatContext *s, const HEIFGrid *grid,
     if (tile_grid->nb_tiles != size)
         return AVERROR_INVALIDDATA;
 
+    for (int i = 0; i < size; i++)
+        if (!grid->tile_item_list[i])
+            return AVERROR_INVALIDDATA;
     for (int i = 0; i < tile_cols; i++)
         tile_grid->coded_width  += grid->tile_item_list[i]->width;
     for (int i = 0; i < size; i += tile_cols)
-- 
2.43.2

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