win32.c: unknown reparse tags

* win32/win32.c (rb_w32_read_reparse_point): skip unknown reparse
  tags.  [ruby-core:83539] [Bug #14047]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60421 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/win32.c

@@ -5017,7 +5017,7 @@ rb_w32_read_reparse_point(const WCHAR *path, rb_w32_reparse_buffer_t *rp,
 	    ret = rp->SymbolicLinkReparseBuffer.PrintNameLength;
 	    *len = ret / sizeof(WCHAR);
 	}
-	else { /* IO_REPARSE_TAG_MOUNT_POINT */
+	else if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) {
 	    static const WCHAR *volume = L"Volume{";
 	    enum {volume_prefix_len = rb_strlen_lit("\\??\\")};
 	    name = ((char *)rp->MountPointReparseBuffer.PathBuffer +
@@ -5030,6 +5030,9 @@ rb_w32_read_reparse_point(const WCHAR *path, rb_w32_reparse_buffer_t *rp,
 		memcmp(name, volume, sizeof(volume) - 1 * sizeof(WCHAR)) == 0)
 		return -1;
 	}
+	else {
+	    return -1;
+	}
 	*result = name;
 	if (e) {
 	    if ((char *)name + ret + sizeof(WCHAR) > (char *)rp + bufsize)