Sven Baars : kernelbase: Also call NtOpenKeyEx() on empty key names.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 88fa3459b928c6d27f56c67778c0e5d45ebbaa5b
URL:    https://gitlab.winehq.org/wine/wine/-/commit/88fa3459b928c6d27f56c67778c0e5d...

Author: Sven Baars 
Date:   Fri Mar 17 11:56:31 2023 +0100

kernelbase: Also call NtOpenKeyEx() on empty key names.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54691

---

dlls/advapi32/tests/registry.c | 4 ++--
 dlls/kernelbase/registry.c     | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/dlls/advapi32/tests/registry.c b/dlls/advapi32/tests/registry.c
index 723950a4d0f..528875261d6 100644
--- a/dlls/advapi32/tests/registry.c
+++ b/dlls/advapi32/tests/registry.c
@@ -1510,11 +1510,11 @@ static void test_reg_delete_key(void)
     ok(ret == ERROR_SUCCESS, "Could not open key, got %ld\n", ret);

ret = RegDeleteKeyExA(key, "", KEY_WOW64_32KEY, 0);
-    todo_wine_if(ptr_size == 64) ok(ret == ERROR_SUCCESS, "RegDeleteKeyExA failed, got %ld\n", ret);
+    ok(ret == ERROR_SUCCESS, "RegDeleteKeyExA failed, got %ld\n", ret);
     RegCloseKey(key);

ret = RegOpenKeyExA(hkey_main, "deleteme", 0, KEY_READ | KEY_WOW64_32KEY, &key);
-    todo_wine_if(ptr_size == 64) ok(ret == ERROR_FILE_NOT_FOUND, "Key was not deleted, got %ld\n", ret);
+    ok(ret == ERROR_FILE_NOT_FOUND, "Key was not deleted, got %ld\n", ret);
     RegCloseKey(key);
 }

diff --git a/dlls/kernelbase/registry.c b/dlls/kernelbase/registry.c
index d414b210026..daf1afa2cd6 100644
--- a/dlls/kernelbase/registry.c
+++ b/dlls/kernelbase/registry.c
@@ -155,7 +155,7 @@ static NTSTATUS open_subkey( HKEY *subkey, HKEY root, UNICODE_STRING *name, DWOR
     attr.SecurityDescriptor = NULL;
     attr.SecurityQualityOfService = NULL;

-    if (buffer[0] == '\') return STATUS_OBJECT_PATH_INVALID;
+    if (len > 0 && buffer[0] == '\') return STATUS_OBJECT_PATH_INVALID;
     while (i < len && buffer[i] != '\') i++;

str.Buffer = name->Buffer;
@@ -202,7 +202,7 @@ static NTSTATUS open_subkey( HKEY *subkey, HKEY root, UNICODE_STRING *name, DWOR
 /* wrapper for NtOpenKeyEx to handle Wow6432 nodes */
 static NTSTATUS open_key( HKEY *retkey, HKEY root, UNICODE_STRING name, DWORD options, ACCESS_MASK access )
 {
-    HKEY subkey, subkey_root = root;
+    HKEY subkey = 0, subkey_root = root;
     NTSTATUS status = 0;

*retkey = NULL;
@@ -228,7 +228,7 @@ static NTSTATUS open_key( HKEY *retkey, HKEY root, UNICODE_STRING name, DWORD op
         return status;
     }

-    while (!status && name.Length)
+    while (!status && (name.Length || !subkey))
     {
         status = open_subkey( &subkey, subkey_root, &name, options, access );
         if (subkey_root && subkey_root != root) NtClose( subkey_root );