[PATCH 8/8] advapi32: Fail in RegEnumValue on missing value or val_count parameters.

[Bernhard Übelacker]

Bug #38796
Because tests would crash on accessing the val_count parameter here are
tests and fix in a single patch.
---
 dlls/advapi32/registry.c       |  8 +++----
 dlls/advapi32/tests/registry.c | 52 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 4 deletions(-)

diff --git a/dlls/advapi32/registry.c b/dlls/advapi32/registry.c
index 30130b1..cf5a1ac 100644
--- a/dlls/advapi32/registry.c
+++ b/dlls/advapi32/registry.c
@@ -1912,8 +1912,8 @@ LSTATUS WINAPI RegEnumValueW( HKEY hkey, DWORD index, LPWSTR value, LPDWORD val_
     TRACE("(%p,%d,%p,%p,%p,%p,%p,%p)\n",
           hkey, index, value, val_count, reserved, type, data, count );
 
-    /* NT only checks count, not val_count */
-    if ((data && !count) || reserved) return ERROR_INVALID_PARAMETER;
+    if ((data && !count) || reserved || !value || !val_count)
+        return ERROR_INVALID_PARAMETER;
     if (!(hkey = get_special_root_hkey( hkey, 0 ))) return ERROR_INVALID_HANDLE;
 
     total_size = info_size + (MAX_PATH + 1) * sizeof(WCHAR);
@@ -1997,8 +1997,8 @@ LSTATUS WINAPI RegEnumValueA( HKEY hkey, DWORD index, LPSTR value, LPDWORD val_c
     TRACE("(%p,%d,%p,%p,%p,%p,%p,%p)\n",
           hkey, index, value, val_count, reserved, type, data, count );
 
-    /* NT only checks count, not val_count */
-    if ((data && !count) || reserved) return ERROR_INVALID_PARAMETER;
+    if ((data && !count) || reserved || !value || !val_count)
+        return ERROR_INVALID_PARAMETER;
     if (!(hkey = get_special_root_hkey( hkey, 0 ))) return ERROR_INVALID_HANDLE;
 
     total_size = info_size + (MAX_PATH + 1) * sizeof(WCHAR);
diff --git a/dlls/advapi32/tests/registry.c b/dlls/advapi32/tests/registry.c
index c801384..b8b7e1c 100644
--- a/dlls/advapi32/tests/registry.c
+++ b/dlls/advapi32/tests/registry.c
@@ -643,6 +643,32 @@ static void test_enum_value(void)
     ok( !strcmp( value, "Test" ), "value is '%s' instead of Test\n", value );
     ok( !strcmp( data, "foobar" ), "data is '%s' instead of foobar\n", data );
 
+    if (pRegGetValueA) /* avoid a crash on Windows 2000 */
+    {
+        /* no value and no val_count parameter */
+        data_count = 20;
+        type = 1234;
+        strcpy( data, "xxxxxxxxxx" );
+        res = RegEnumValueA( test_key, 0, NULL, NULL, NULL, &type, (BYTE*)data, &data_count );
+        ok( res == ERROR_INVALID_PARAMETER, "expected ERROR_INVALID_PARAMETER, got %d\n", res );
+
+        /* no value parameter */
+        val_count = 20;
+        data_count = 20;
+        type = 1234;
+        strcpy( data, "xxxxxxxxxx" );
+        res = RegEnumValueA( test_key, 0, NULL, &val_count, NULL, &type, (BYTE*)data, &data_count );
+        ok( res == ERROR_INVALID_PARAMETER, "expected ERROR_INVALID_PARAMETER, got %d\n", res );
+
+        /* no val_count parameter */
+        data_count = 20;
+        type = 1234;
+        strcpy( value, "xxxxxxxxxx" );
+        strcpy( data, "xxxxxxxxxx" );
+        res = RegEnumValueA( test_key, 0, value, NULL, NULL, &type, (BYTE*)data, &data_count );
+        ok( res == ERROR_INVALID_PARAMETER, "expected ERROR_INVALID_PARAMETER, got %d\n", res );
+    }
+
     /* Unicode tests */
 
     SetLastError(0xdeadbeef);
@@ -710,6 +736,32 @@ static void test_enum_value(void)
     ok( !memcmp( valueW, testW, sizeof(testW) ), "value is not 'Test'\n" );
     ok( !memcmp( dataW, foobarW, sizeof(foobarW) ), "data is not 'foobar'\n" );
 
+    if (pRegGetValueA) /* avoid a crash on Windows 2000 */
+    {
+        /* no valueW and no val_count parameter */
+        data_count = 20;
+        type = 1234;
+        memcpy( dataW, xxxW, sizeof(xxxW) );
+        res = RegEnumValueW( test_key, 0, NULL, NULL, NULL, &type, (BYTE*)dataW, &data_count );
+        ok( res == ERROR_INVALID_PARAMETER, "expected ERROR_INVALID_PARAMETER, got %d\n", res );
+
+        /* no valueW parameter */
+        val_count = 20;
+        data_count = 20;
+        type = 1234;
+        memcpy( dataW, xxxW, sizeof(xxxW) );
+        res = RegEnumValueW( test_key, 0, NULL, &val_count, NULL, &type, (BYTE*)dataW, &data_count );
+        ok( res == ERROR_INVALID_PARAMETER, "expected ERROR_INVALID_PARAMETER, got %d\n", res );
+
+        /* no val_count parameter */
+        data_count = 20;
+        type = 1234;
+        memcpy( valueW, xxxW, sizeof(xxxW) );
+        memcpy( dataW, xxxW, sizeof(xxxW) );
+        res = RegEnumValueW( test_key, 0, valueW, NULL, NULL, &type, (BYTE*)dataW, &data_count );
+        ok( res == ERROR_INVALID_PARAMETER, "expected ERROR_INVALID_PARAMETER, got %d\n", res );
+    }
+
 cleanup:
     RegDeleteKeyA(test_key, "");
     RegCloseKey(test_key);
-- 
2.1.4