html: use strings.EqualFold instead of lowering ourselves

Instead of using strings.ToLower and == to check case insensitive
equality, just use strings.EqualFold, even when the strings are only
ASCII. This prevents us unnecessarily lowering extremely long strings,
which can be a somewhat expensive operation, even if we're only
attempting to compare equality with five characters.

Thanks to Guido Vranken for reporting this issue.

Fixes golang/go#70906
Fixes CVE-2024-45338

Change-Id: I323b919f912d60dab6a87cadfdcac3e6b54cd128
Reviewed-on: https://go-review.googlesource.com/c/net/+/637536
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Tatiana Bradley <tatianabradley@google.com>
3 files changed
tree: 372fd8869db486bd4f8884cbcce40e379b317e8b
  1. bpf/
  2. context/
  3. dict/
  4. dns/
  5. html/
  6. http/
  7. http2/
  8. icmp/
  9. idna/
  10. internal/
  11. ipv4/
  12. ipv6/
  13. lif/
  14. nettest/
  15. netutil/
  16. proxy/
  17. publicsuffix/
  18. quic/
  19. route/
  20. trace/
  21. webdav/
  22. websocket/
  23. xsrftoken/
  24. .gitattributes
  25. .gitignore
  26. codereview.cfg
  27. CONTRIBUTING.md
  28. go.mod
  29. go.sum
  30. LICENSE
  31. PATENTS
  32. README.md
README.md

Go Networking

Go Reference

This repository holds supplementary Go networking packages.

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This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see https://go.dev/doc/contribute.

The git repository is https://go.googlesource.com/net.

The main issue tracker for the net repository is located at https://go.dev/issues. Prefix your issue with “x/net:” in the subject line, so it is easy to find.