mingw: consider that UNICODE_STRING::Length counts bytes

max630 · gitster · commit c46458e82f01 · 2016-12-20T09:04:57.000-08:00
UNICODE_STRING::Length field means size of buffer in bytes[1], despite of buffer itself being array of wchar_t. Because of that terminating zero is placed twice as far. Fix it. [1] https://msdn.microsoft.com/en-us/library/windows/desktop/aa380518.aspx Signed-off-by: Max Kirillov <max@max630.net> Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/compat/winansi.c b/compat/winansi.c
@@ -553,7 +553,7 @@ static void detect_msys_tty(int fd)
 			buffer, sizeof(buffer) - 2, &result)))
 		return;
 	name = nameinfo->Name.Buffer;
-	name[nameinfo->Name.Length] = 0;
+	name[nameinfo->Name.Length / sizeof(*name)] = 0;
 
 	/* check if this could be a MSYS2 pty pipe ('msys-XXXX-ptyN-XX') */
 	if (!wcsstr(name, L"msys-") || !wcsstr(name, L"-pty"))
