reg: Add a check for multiple backslashes at the end of the key.

programs/reg/reg.c

@@ -181,6 +181,14 @@ static LPBYTE get_regdata(LPWSTR data, DWORD reg_type, WCHAR separator, DWORD *r
 
 static BOOL sane_path(const WCHAR *key)
 {
+    unsigned int i = strlenW(key);
+
+    if (i < 3 || (key[i - 1] == '\\' && key[i - 2] == '\\'))
+    {
+        reg_message(STRING_INVALID_KEY);
+        return FALSE;
+    }
+
     if (key[0] == '\\' && key[1] == '\\' && key[2] != '\\')
     {
         reg_message(STRING_NO_REMOTE);

programs/reg/tests/reg.c

@@ -129,10 +129,10 @@ static void test_add(void)
     ok(err == ERROR_FILE_NOT_FOUND, "got exit code %d\n", r);
 
     run_reg_exe("reg add HKCU\\" KEY_BASE "\\keytest2\\\\ /f", &r);
-    todo_wine ok(r == REG_EXIT_FAILURE || broken(r == REG_EXIT_SUCCESS /* WinXP */),
+    ok(r == REG_EXIT_FAILURE || broken(r == REG_EXIT_SUCCESS /* WinXP */),
         "got exit code %u\n", r);
     err = RegDeleteKeyA(HKEY_CURRENT_USER, KEY_BASE "\\keytest2");
-    todo_wine ok(err == ERROR_FILE_NOT_FOUND || broken(err == ERROR_SUCCESS /* WinXP */),
+    ok(err == ERROR_FILE_NOT_FOUND || broken(err == ERROR_SUCCESS /* WinXP */),
         "got exit code %d\n", r);
 
     run_reg_exe("reg add HKCU\\" KEY_BASE "\\keytest3\\ /f", &r);