tree bf64349653585fad2ff7317c1d57f18ccc5d3574
parent 801b95f34349ff15e4e2650ae86beea2bda5eeef
author Hui Yingst <nigi@chromium.org> 1578929887 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1578929887 +0000

Add string validations in StringToCode() and StringToWideString().

Add the following validations in CPDF_ToUnicodeMap::StringToCode():
(1) Check whether the string has matching "<" and ">".
(2) Check whether the string represents a valid hexadecimal number.
(3) Detect integer overflow.

In CPDF_ToUnicodeMap::StringToWideString(), add a check for matching
"<" and ">". No need to add invalid hex character check since Acrobat
and Okular both ignore the rest of the string when encountering
invalid characters.

This CL also updates the unit test for StringToCode() and
StringToWideString() according to the changes above.

Bug: pdfium:1422
Change-Id: Ie3608515670b8d1efd6909b6f465e2d0e2e7ebf6
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/62550
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Hui Yingst <nigi@chromium.org>