math/big: check buffer lengths in GobDecode

In Float.GobDecode and Rat.GobDecode, check buffer sizes before
indexing slices.

Fixes #53871

Change-Id: I1b652c32c2bc7a0e8aa7620f7be9b2740c568b0a
TryBot-Result: Gopher Robot <>
Reviewed-by: Tatiana Bradley <>
Run-TryBot: Roland Shoemaker <>
4 files changed
tree: 7d2c3cb068cabbeece31d6782b7153693e2570f4
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg

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