fonts: Fix memory allocation for fallback glyphs.
When allocating the mask for a fallback glyph, we allocate it on the
arena on the SkScalerContext while the image belongs to a glyph on a
different cache. This can lead to use-after-free bugs if accessing the
image after the context owning that memory is destroyed. Fix this by
allocating on the arena from the owning cache.
R=herb@google.com, mtklein@google.com
Bug: 829622
Change-Id: Ife53e24f5bc868f36c43f2adcd7a2629ab5577fe
Reviewed-on: https://skia-review.googlesource.com/134182
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
10 files changed