[FFmpeg-devel] [PATCH 1/3] avformat/mov: Check sample_sizes before using it

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 1/3] avformat/mov: Check sample_sizes before using it
Date: Fri, 26 Jul 2024 23:08:30 +0200
Message-ID: <20240726210832.288597-1-michael@niedermayer.cc> (raw)

Fixes: NULL pointer dereference
Fixes: 70569/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5247918563459072

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 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index b74e43e2140..63db7d59a58 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -10060,6 +10060,10 @@ static int mov_read_header(AVFormatContext *s)
 
             st = item->st;
             sc = st->priv_data;
+
+            if (!sc->sample_sizes || !sc->sample_count)
+                return AVERROR_INVALIDDATA;
+
             st->codecpar->width  = item->width;
             st->codecpar->height = item->height;
 
-- 
2.45.2

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