encoding/xml: limit depth of nesting in unmarshal
Prevent exhausting the stack limit when unmarshalling extremely deeply
nested structures into nested types.
Fixes #53611
Fixes CVE-2022-30633
Change-Id: Ic6c5d41674c93cfc9a316135a408db9156d39c59
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/
1421319
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Julie Qiu <julieqiu@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/417061
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>