[librsvg/librsvg-2.40: 9/10] Merge branch 'cve-2019-20446-2.40' into librsvg-2.40

[Federico Mena Quintero <federico src gnome org>]

commit 27f1f35557515747c423ab780d7b1a2d7a711fa1
Merge: ef720eea 668a0ef2
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Feb 26 11:40:25 2020 -0600

    Merge branch 'cve-2019-20446-2.40' into librsvg-2.40

 rsvg-base.c                                        | 107 +++++++++--
 rsvg-cairo-render.c                                |  10 +-
 rsvg-private.h                                     |   6 +
 rsvg-structure.c                                   |  53 +++---
 tests/Makefile.am                                  |   9 +-
 tests/errors.c                                     | 100 +++++++++++
 tests/fixtures/errors/308-doubly-recursive-use.svg |  13 ++
 tests/fixtures/errors/308-recursive-use.svg        |   9 +
 tests/fixtures/errors/308-use-self-ref.svg         |   7 +
 tests/fixtures/errors/323-nested-use.svg           | 196 +++++++++++++++++++++
 .../fixtures/errors/515-pattern-billion-laughs.svg | 130 ++++++++++++++
 tests/fixtures/errors/515-too-many-elements.svgz   | Bin 0 -> 40811 bytes
 12 files changed, 603 insertions(+), 37 deletions(-)
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