From 1ba8484559661dfdbca36dbc17b203f33f62e26c Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 31 May 2020 14:24:04 +0200
Subject: [PATCH] avformat/thp: Check compcount

Fixes: out of array access
Fixes: 22520/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5100297658826752

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

diff --git a/libavformat/thp.c b/libavformat/thp.c
index d3ae86c645..4abff1313a 100644
--- a/libavformat/thp.c
+++ b/libavformat/thp.c
@@ -93,6 +93,9 @@ static int thp_read_header(AVFormatContext *s)
     avio_seek (pb, thp->compoff, SEEK_SET);
     thp->compcount       = avio_rb32(pb);
 
+    if (thp->compcount > FF_ARRAY_ELEMS(thp->components))
+        return AVERROR_INVALIDDATA;
+
     /* Read the list of component types.  */
     avio_read(pb, thp->components, 16);