Z991239-385 #comment 宽字节转换修复BUG

winpr/libwinpr/crt/unicode.c

@@ -170,7 +170,7 @@ int MultiByteToWideChar(UINT CodePage, DWORD dwFlags, LPCSTR lpMultiByteStr, int
 
 	if (cbMultiByte == -1)
 	{
-		size_t len = strnlen((const char*)lpMultiByteStr, INT32_MAX);
+		size_t len = lpMultiByteStr ? strnlen((const char*)lpMultiByteStr, INT32_MAX) : INT32_MAX;
 		if (len >= INT32_MAX)
 			return 0;
 		cbMultiByte = (int)len + 1;
@@ -296,7 +296,7 @@ int WideCharToMultiByte(UINT CodePage, DWORD dwFlags, LPCWSTR lpWideCharStr, int
 
 	if (cchWideChar == -1)
 	{
-		size_t len = _wcslen(lpWideCharStr);
+		size_t len = lpWideCharStr ? _wcslen(lpWideCharStr) : INT32_MAX;
 		if (len >= INT32_MAX)
 			return 0;
 		cchWideChar = (int)len + 1;