tree 80fa8ea402754313a97ac1ecc1c9fce0e2b6c988
parent a2bbe8bcf2a98ba85cd20a8f20e979a2724db269
author Hui Yingst <nigi@chromium.org> 1651130306 +0000
committer Pdfium LUCI CQ <pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1651130306 +0000

Avoid infinite loop caused by floating-point loop counter.

When a floating-point loop counter is incremented/decreased by an amount
that is too small to change its value given its precision, the loop will
get stuck and cause the process to hang.

This CL changes vcgen_dash::calc_dash_start() to decrease `ds` by a
multiple of the total dash length first, so that `ds` won't be too big
to cause an infinite loop.

Bug: pdfium:1822
Change-Id: I3750f8f59260df2c06fd734edce4d57535db8e12
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/93071
Commit-Queue: Nigi <nigi@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>