win32.c: fail before getting ITEMIDLIST

* win32/win32.c (get_special_folder): fail before getting
  ITEMIDLIST if the buffer is less than 260 word which
  SHGetPathFromIDListW requires.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55269 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 1 deletions

diff --git a/win32/win32.c b/win32/win32.c
index c66ce614ff..18cf4f49e9 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -433,12 +433,13 @@ get_special_folder(int n, WCHAR *buf, size_t len)
 	func = (get_path_func)
 	    get_proc_address("shell32", "SHGetPathFromIDListEx", NULL);
     }
+    if (!func && len < 260) return FALSE;
 
     if (SHGetSpecialFolderLocation(NULL, n, &pidl) == 0) {
 	if (func) {
 	    f = func(pidl, buf, len, 0);
 	}
-	else if (len >= 260) {
+	else {
 	    f = SHGetPathFromIDListW(pidl, buf);
 	}
 	SHGetMalloc(&alloc);