[librsvg/librsvg-2.42: 7/8] Merge branch 'cve-2019-20446-2.42' into librsvg-2.42

[Federico Mena Quintero <federico src gnome org>]

commit de06fe850890ed9e4f84ce8225bf165f861a9364
Merge: 7a40d7b8 61945d66
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Feb 25 16:55:37 2020 -0600

    Merge branch 'cve-2019-20446-2.42' into librsvg-2.42

 librsvg/rsvg-base.c                                |  90 ++++++++++----
 librsvg/rsvg-private.h                             |   5 +-
 rsvg_internals/src/drawing_ctx.rs                  |  23 ++--
 rsvg_internals/src/structure.rs                    |  21 ++--
 tests/errors.c                                     |  52 ++++++++-
 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 ++
 .../fixtures/errors/515-pattern-billion-laughs.svg | 130 +++++++++++++++++++++
 tests/fixtures/errors/515-too-many-elements.svgz   | Bin 0 -> 40811 bytes
 10 files changed, 310 insertions(+), 40 deletions(-)
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