[FFmpeg-devel] [PATCH 1/3] avformat/tmv: Check video chunk size

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 1/3] avformat/tmv: Check video chunk size
Date: Wed, 11 Oct 2023 20:10:13 +0200
Message-ID: <20231011181015.6433-1-michael@niedermayer.cc> (raw)

This check matches the audio chunk check

Fixes: Timeout
Fixes: 62681/clusterfuzz-testcase-minimized-ffmpeg_dem_TMV_fuzzer-5299107876700160

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/tmv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/tmv.c b/libavformat/tmv.c
index ea39954190..18105f764e 100644
--- a/libavformat/tmv.c
+++ b/libavformat/tmv.c
@@ -103,6 +103,10 @@ static int tmv_read_header(AVFormatContext *s)
     char_cols = avio_r8(pb);
     char_rows = avio_r8(pb);
     tmv->video_chunk_size = char_cols * char_rows * 2;
+    if (!tmv->video_chunk_size) {
+        av_log(s, AV_LOG_ERROR, "invalid video chunk size\n");
+        return AVERROR_INVALIDDATA;
+    }
 
     features  = avio_r8(pb);
     if (features & ~(TMV_PADDING | TMV_STEREO)) {
-- 
2.17.1

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