[PATCH 1/2] ntoskrnl.exe: Avoid loading a driver multiple times in ZwLoadDriver().

[Zebediah Figura]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45805
Signed-off-by: Zebediah Figura 
---
 dlls/ntoskrnl.exe/ntoskrnl.c     | 7 +++++++
 dlls/ntoskrnl.exe/tests/driver.c | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 2b3b2ec0ef..d0112f4904 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -3520,6 +3520,13 @@ NTSTATUS WINAPI ZwLoadDriver( const UNICODE_STRING *service_name )
         return STATUS_NO_MEMORY;
     }

+    if (wine_rb_get( &wine_drivers, &drv_name ))
+    {
+        TRACE( "driver %s already loaded\n", debugstr_us(&drv_name) );
+        RtlFreeUnicodeString( &drv_name );
+        return STATUS_IMAGE_ALREADY_LOADED;
+    }
+
     set_service_status( service_handle, SERVICE_START_PENDING, 0 );

status = IoCreateDriver( &drv_name, init_driver );
diff --git a/dlls/ntoskrnl.exe/tests/driver.c b/dlls/ntoskrnl.exe/tests/driver.c
index 17e54cd508..6ab5c3e054 100644
--- a/dlls/ntoskrnl.exe/tests/driver.c
+++ b/dlls/ntoskrnl.exe/tests/driver.c
@@ -206,6 +206,9 @@ static void test_load_driver(void)
     ret = ZwLoadDriver(&name);
     ok(!ret, "got %#x\n", ret);

+    ret = ZwLoadDriver(&name);
+    ok(ret == STATUS_IMAGE_ALREADY_LOADED, "got %#x\n", ret);
+
     ret = ZwUnloadDriver(&name);
     ok(!ret, "got %#x\n", ret);
 }