diff options
| -rw-r--r-- | src/math/big/ratconv.go | 5 | ||||
| -rw-r--r-- | src/math/big/ratconv_test.go | 1 |
2 files changed, 6 insertions, 0 deletions
diff --git a/src/math/big/ratconv.go b/src/math/big/ratconv.go index ac3c8bd11f8..90053a9c81d 100644 --- a/src/math/big/ratconv.go +++ b/src/math/big/ratconv.go @@ -169,6 +169,11 @@ func (z *Rat) SetString(s string) (*Rat, bool) { n := exp5 if n < 0 { n = -n + if n < 0 { + // This can occur if -n overflows. -(-1 << 63) would become + // -1 << 63, which is still negative. + return nil, false + } } if n > 1e6 { return nil, false // avoid excessively large exponents diff --git a/src/math/big/ratconv_test.go b/src/math/big/ratconv_test.go index 15d206cb386..e55e6557189 100644 --- a/src/math/big/ratconv_test.go +++ b/src/math/big/ratconv_test.go @@ -104,6 +104,7 @@ var setStringTests = []StringTest{ {in: "4/3/"}, {in: "4/3."}, {in: "4/"}, + {in: "13e-9223372036854775808"}, // CVE-2022-23772 // valid {"0", "0", true}, |