From 90dce9340c2dff91c7f04ba22feaef4c5e10816e Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Sat, 1 Feb 2025 15:22:13 +0200
Subject: [PATCH] [NTDLL] check for NULL buffer in LdrpLoadDll

This happens in advapi32_apitest in Test_CreateOpenKey.
---
 dll/ntdll/ldr/ldrutils.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dll/ntdll/ldr/ldrutils.c b/dll/ntdll/ldr/ldrutils.c
index e46bb3446dd..4e1f7ffb04e 100644
--- a/dll/ntdll/ldr/ldrutils.c
+++ b/dll/ntdll/ldr/ldrutils.c
@@ -2423,6 +2423,12 @@ LdrpLoadDll(IN BOOLEAN Redirected,
     PLDR_DATA_TABLE_ENTRY LdrEntry;
     BOOLEAN InInit = LdrpInLdrInit;
 
+    if (DllName->Buffer == NULL)
+    {
+        DPRINT1("DllName->Buffer is NULL!\n");
+        return STATUS_INVALID_PARAMETER;
+    }
+
     /* Save the Raw DLL Name */
     if (DllName->Length >= sizeof(NameBuffer)) return STATUS_NAME_TOO_LONG;
     RtlInitEmptyUnicodeString(&RawDllName, NameBuffer, sizeof(NameBuffer));