https://git.ruby-lang.org/ruby.git/commit/?id=67d2619463

From 67d2619463061beafe86a773310962365380577f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 21 Feb 2021 13:12:03 +0900
Subject: Expand final path name buffer for namespace prefix

As final path name includes the namespace prefix, so expand room
for it in path name buffer.
---
 win32/win32.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/win32/win32.c b/win32/win32.c
index 8f99805..03e5f13 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -1989,12 +1989,16 @@ open_special(const WCHAR *path, DWORD access, DWORD flags) https://github.com/ruby/ruby/blob/trunk/win32/win32.c#L1989
 #define BitOfIsRep(n) ((n) * 2 + 1)
 #define DIRENT_PER_CHAR (CHAR_BIT / 2)
 
+static const WCHAR namespace_prefix[] = {L'\\', L'\\', L'?', L'\\'};
+
+enum {FINAL_PATH_MAX = PATH_MAX + numberof(namespace_prefix)};
+
 /* License: Artistic or GPL */
 static HANDLE
 open_dir_handle(const WCHAR *filename, WIN32_FIND_DATAW *fd)
 {
     HANDLE fh;
-    WCHAR fullname[PATH_MAX + rb_strlen_lit("\\*")];
+    WCHAR fullname[FINAL_PATH_MAX + rb_strlen_lit("\\*")];
     WCHAR *p;
     int len = 0;
 
@@ -2004,8 +2008,12 @@ open_dir_handle(const WCHAR *filename, WIN32_FIND_DATAW *fd) https://github.com/ruby/ruby/blob/trunk/win32/win32.c#L2008
 
     fh = open_special(filename, 0, 0);
     if (fh != INVALID_HANDLE_VALUE) {
-	len = get_final_path(fh, fullname, PATH_MAX, 0);
+	len = get_final_path(fh, fullname, FINAL_PATH_MAX, 0);
 	CloseHandle(fh);
+	if (len >= FINAL_PATH_MAX) {
+	    errno = ENAMETOOLONG;
+	    return INVALID_HANDLE_VALUE;
+	}
     }
     if (!len) {
 	len = lstrlenW(filename);
@@ -5666,8 +5674,6 @@ path_drive(const WCHAR *path) https://github.com/ruby/ruby/blob/trunk/win32/win32.c#L5674
 	towupper(path[0]) - L'A' : _getdrive() - 1;
 }
 
-static const WCHAR namespace_prefix[] = {L'\\', L'\\', L'?', L'\\'};
-
 /* License: Ruby's */
 static int
 winnt_stat(const WCHAR *path, struct stati128 *st, BOOL lstat)
-- 
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