From 139bf412464e62a83984cd49093936dcaa7a0865 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Thu, 11 Jul 2024 19:29:14 +0200
Subject: [PATCH] avformat/mm: Check length

Fixes: CID1220824 Overflowed constant

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mm.c b/libavformat/mm.c
index 23c025d852..e377ed4fbb 100644
--- a/libavformat/mm.c
+++ b/libavformat/mm.c
@@ -95,7 +95,7 @@ static int read_header(AVFormatContext *s)
     type = avio_rl16(pb);
     length = avio_rl32(pb);
 
-    if (type != MM_TYPE_HEADER)
+    if (type != MM_TYPE_HEADER || length < 10)
         return AVERROR_INVALIDDATA;
 
     /* read header */