From a63efc45c908bfd46c60e95956cce499a2c92e44 Mon Sep 17 00:00:00 2001
From: Roland Shoemaker <roland@golang.org>
Date: Mon, 28 Mar 2022 18:41:26 -0700
Subject: [PATCH 07/10] [release-branch.go1.17] encoding/xml: use iterative
 Skip, rather than recursive

Prevents exhausting the stack limit in _incredibly_ deeply nested
structures.

Fixes #53711
Updates #53614
Fixes CVE-2022-28131

Change-Id: I47db4595ce10cecc29fbd06afce7b299868599e6
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1419912
Reviewed-by: Julie Qiu <julieqiu@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
(cherry picked from commit 9278cb78443d2b4deb24cbb5b61c9ba5ac688d49)
Reviewed-on: https://go-review.googlesource.com/c/go/+/417068
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>

Conflict: NA
Reference: https://go-review.googlesource.com/c/go/+/417068
---
 src/encoding/xml/read.go | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/encoding/xml/read.go b/src/encoding/xml/read.go
index e0ed8b527ce..c77579880cb 100644
--- a/src/encoding/xml/read.go
+++ b/src/encoding/xml/read.go
@@ -743,12 +743,12 @@ Loop:
 }
 
 // Skip reads tokens until it has consumed the end element
-// matching the most recent start element already consumed.
-// It recurs if it encounters a start element, so it can be used to
-// skip nested structures.
+// matching the most recent start element already consumed,
+// skipping nested structures.
 // It returns nil if it finds an end element matching the start
 // element; otherwise it returns an error describing the problem.
 func (d *Decoder) Skip() error {
+	var depth int64
 	for {
 		tok, err := d.Token()
 		if err != nil {
@@ -756,11 +756,12 @@ func (d *Decoder) Skip() error {
 		}
 		switch tok.(type) {
 		case StartElement:
-			if err := d.Skip(); err != nil {
-				return err
-			}
+			depth++
 		case EndElement:
-			return nil
+			if depth == 0 {
+				return nil
+			}
+			depth--
 		}
 	}
 }
-- 
2.30.2