[release-branch.go1.20] go/scanner: reject large line and column numbers in //line directives

Setting a large line or column number using a //line directive can cause
integer overflow even in small source files.

Limit line and column numbers in //line directives to 2^30-1, which
is small enough to avoid int32 overflow on all reasonbly-sized files.

Fixes CVE-2023-24537
For #59180
Fixes #59274

Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1802456
Reviewed-by: Julie Qiu <julieqiu@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
Change-Id: Ib9c5cb38428ed34ab129d451b00a2998e72c861c
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1802401
TryBot-Result: Security TryBots <security-trybots@go-security-trybots.iam.gserviceaccount.com>
Run-TryBot: Roland Shoemaker <bracewell@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/481992
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Bypass: Michael Knyszek <mknyszek@google.com>
2 files changed
tree: ca0630322d020515e0fa1777532cd8941d8ca4eb
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. LICENSE
  13. PATENTS
  14. README.md
  15. SECURITY.md
  16. VERSION
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