compress/flate: fix deflate Reset consistency

Modify the overflow detection logic to shuffle the contents
of the table to a lower offset to avoid leaking the effects
of a previous use of compress.Writer past Reset calls.

Fixes #34121

Change-Id: I9963eadfa5482881e7b7adbad4c2cae146b669ab
GitHub-Last-Rev: 8b35798cdd4d5a901d6422647b12984d7e500ba3
GitHub-Pull-Request: golang/go#34128
Reviewed-on: https://go-review.googlesource.com/c/go/+/193605
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2 files changed
tree: a929d20e25d4732168e53487d51cc45ad734d17d
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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