chore: cherry-pick a48de319c521 from pdfium #33715
Merged
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Use safe arithmetic in CJBig2_Context::ParseSymbolDict()
These should be mitigated by size checks higher up, but it wouldn't
hurt to be sure.
Bug: chromium:1280743
Change-Id: I03c46e3d11316a9f9634256bd0e2394548d2681e
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/88290
Reviewed-by: Lei Zhang thestig@chromium.org
Commit-Queue: Tom Sepez tsepez@chromium.org
Notes: Security: backported fix for chromium:1280743.