Return nullptr when ReadBuffer becomes invalid
This especially helps in SkDrawLooper because we can bail out early
instead of looping for a potentially long time, e.g. when fuzzed
input says count is a large number.
This also cleans up validate in a few spots, and adds validateCanReadN
as a helper function.
Bug: skia:7937
Change-Id: Ic5eff357c8cadc91eeafc6e39c78c570ba74df2f
Reviewed-on: https://skia-review.googlesource.com/128847
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
11 files changed