tree fefac1d2733cb08473150c10f0354bc91b6a2e46
parent f1160c7d26e736baba758467daf5fa42fb85b51a
author Lei Zhang <thestig@chromium.org> 1552419438 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1552419438 +0000

Avoid crashing inside CPDF_DIBBase.

Currently, CPDF_ImageRenderer::Continue() can fail in |Mode::kDefault|,
and then attempt to restart rendering. In valid uses of this code path,
the rendering mode switches to |Mode::kBlend|. In the crashing case, the
rendering mode remains as |Mode::kDefault|. Avoid this crash by checking
if the rendering mode stays the same and refusing to continue.

BUG=pdfium:1219

Change-Id: I232cb4da2a248f923f09de7d4f08b30ae7dde832
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/51450
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>