tree adc52620ea54582f5e37d8929fa0db3b9af4c9e4
parent 22005377e18eda4e72f585b7ed0def43f696f1e9
author Lei Zhang <thestig@chromium.org> 1568919626 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1568919626 +0000

Gracefully handle a failure in FPDF_FileAccessContext.

https://pdfium-review.googlesource.com/47551 added a checked_cast() call
in FPDF_FileAccessContext::ReadBlockAtOffset(), which crashes on
failure. Switch to IsValueInRangeForNumericType() and return false
instead.

CPDFSDK_CustomAccess::ReadBlockAtOffset() has the same pattern, so apply
the same change here.

Change-Id: Ib03e840bb40a7ac9c0dda0cc5f242da64594de52
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/60830
Reviewed-by: Chris Palmer <palmer@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>