server: Prevent unloading a registry hive while the key is in use.

Otherwise, RegUnLoadKey(HKEY_USERS, "S-1-5-21-0-0-0-1000") erases all HKCU registry. The call is actually done by a certain installer. Signed-off-by: Akihiro Sagawa <sagawa.aki@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

server: Prevent unloading a registry hive while the key is in use.
70c77cdf · Akihiro Sagawa · Alexandre Julliard · d6d99e59 · 70c77cdf
Commit 70c77cdf authored Feb 12, 2021 by Akihiro Sagawa Committed by Alexandre Julliard Feb 17, 2021
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registry.c server/registry.c +4 -1

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--- a/server/registry.c
+++ b/server/registry.c
@@ -2261,7 +2261,10 @@ DECL_HANDLER(unload_registry)
        get_req_path( &name, !req->parent );
        if ((key = open_key( parent, &name, access, req->attributes )))
        {
-            delete_key( key, 1 );     /* FIXME */
+            if (key->obj.handle_count)
+                set_error( STATUS_CANNOT_DELETE );
+            else
+                delete_key( key, 1 );     /* FIXME */
            release_object( key );
        }
        release_object( parent );