From 0476b6ee1eaa258c7b527de0f477f6b4c9838dab Mon Sep 17 00:00:00 2001
From: Zane van Iperen <zane@zanevaniperen.com>
Date: Sun, 6 Sep 2020 11:00:17 +1000
Subject: [PATCH] avformat/argo_asf: bail if invalid tag

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
---
 libavformat/argo_asf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/argo_asf.c b/libavformat/argo_asf.c
index bf9b5d0c0a..208280b4d9 100644
--- a/libavformat/argo_asf.c
+++ b/libavformat/argo_asf.c
@@ -144,6 +144,9 @@ static int argo_asf_read_header(AVFormatContext *s)
 
     argo_asf_parse_file_header(&asf->fhdr, buf);
 
+    if (asf->fhdr.magic != ASF_TAG)
+        return AVERROR_INVALIDDATA;
+
     if (asf->fhdr.num_chunks == 0) {
         return AVERROR_INVALIDDATA;
     } else if (asf->fhdr.num_chunks > 1) {