From d4993c67cd8e9bb724ceeb26e0b252273c8184e1 Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Tue, 19 Sep 2023 18:32:00 +0300
Subject: [PATCH] [CRT] Fix parameter check for _memicmp on NT 6+

Fixes a crash in msvcrt_winetest:string
---
 sdk/lib/crt/mem/memicmp.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sdk/lib/crt/mem/memicmp.c b/sdk/lib/crt/mem/memicmp.c
index b98608b3242..e99d9b2a2a2 100644
--- a/sdk/lib/crt/mem/memicmp.c
+++ b/sdk/lib/crt/mem/memicmp.c
@@ -8,6 +8,19 @@ int
 CDECL
 _memicmp(const void *s1, const void *s2, size_t n)
 {
+    if (NtCurrentPeb()->OSMajorVersion >= 6)
+    {
+        if (!s1 || !s2)
+        {
+            if (n != 0)
+            {
+                MSVCRT_INVALID_PMT(NULL, EINVAL);
+                return _NLSCMPERROR;
+            }
+            return 0;
+        }
+    }
+
   if (n != 0)
   {
     const unsigned char *p1 = s1, *p2 = s2;