tree fbee70533185e962adebb082dfa587e80c325873
parent a5fc8975c865dc3cc90de8ff46ca13fb46c13391
author Henrique Nakashima <hnakashima@chromium.org> 1507129725 -0400
committer Chromium commit bot <commit-bot@chromium.org> 1507132964 +0000

Fix UAF in SetVisible().

SetVisible() may be called during Destroy() which may be called
during SetVisible().

This fixes the latest in a family of bugs that happen after an
instance is freed by code triggered by JS code while it's executing
a method.

The CL has a lot of protection for many of these points where JS
may be executed and potentially destroy objects. The return types
of many methods that may execute JS have been changed to bool,
indicating whether the instance is still alive after the call.

Bug: chromium:770148
Change-Id: If5a9db4d8d6aac10f4dd6b645922bb96c116684d
Reviewed-on: https://pdfium-review.googlesource.com/15190
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>