From da5d8ff58d4b0992c1dc7f04817f2ba9c1559b5f Mon Sep 17 00:00:00 2001
From: Anton Baskanov <baskanov@gmail.com>
Date: Sun, 8 Sep 2024 21:18:30 +0700
Subject: [PATCH] dplayx: Check the message size before access.

---
 dlls/dplayx/dplaysp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/dplayx/dplaysp.c b/dlls/dplayx/dplaysp.c
index fa6ea871495d..535e7fa85c26 100644
--- a/dlls/dplayx/dplaysp.c
+++ b/dlls/dplayx/dplaysp.c
@@ -219,6 +219,9 @@ static HRESULT WINAPI IDirectPlaySPImpl_HandleMessage( IDirectPlaySP *iface, voi
   FIXME( "(%p)->(%p,0x%08lx,%p): mostly stub\n",
          This, lpMessageBody, dwMessageBodySize, lpMessageHeader );
 
+  if ( dwMessageBodySize < sizeof( DPMSG_SENDENVELOPE ) )
+    return DPERR_GENERIC;
+
   wCommandId = lpMsg->wCommandId;
   wVersion   = lpMsg->wVersion;