math/big: check for excessive exponents in Rat.SetString
Found by oss-fuzz https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33284 Fixes #45910. Change-Id: I61e7b04dbd80343420b57eede439e361c0f7b79c Reviewed-on: https://go-review.googlesource.com/c/go/+/316149 Trust: Robert Griesemer <gri@golang.org> Trust: Katie Hockman <katie@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by:Katie Hockman <katie@golang.org> Reviewed-by:
Emmanuel Odeke <emmanuel@orijtech.com>
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