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crypto/bn256: fix bn256Mul fuzzer to not hang on large input (#21872)

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* crypto/bn256: fix bn256Mul fuzzer to not hang on large input

* Update crypto/bn256/bn256_fuzz.go

Co-authored-by: ligi <ligi@ligi.de>

Co-authored-by: ligi <ligi@ligi.de>
This commit is contained in:
Martin Holst Swende 2020-11-20 08:53:10 +01:00 committed by GitHub
parent 6f88d6530a
commit ebb9591c4d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 0 deletions
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6
crypto/bn256/bn256_fuzz.go
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@ -80,6 +80,12 @@ func FuzzMul(data []byte) int {
if remaining == 0 { if remaining == 0 {
return 0 return 0
} }
if remaining > 128 {
// The evm only ever uses 32 byte integers, we need to cap this otherwise
// we run into slow exec. A 236Kb byte integer cause oss-fuzz to report it as slow.
// 128 bytes should be fine though
return 0
}
buf := make([]byte, remaining) buf := make([]byte, remaining)
input.Read(buf) input.Read(buf)