From ebb9591c4d860e85fe1a015e6c9d7e85b7500b9a Mon Sep 17 00:00:00 2001
From: Martin Holst Swende <martin@swende.se>
Date: Fri, 20 Nov 2020 08:53:10 +0100
Subject: [PATCH] crypto/bn256: fix bn256Mul fuzzer to not hang on large input
(#21872)
* 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>
---
crypto/bn256/bn256_fuzz.go | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/crypto/bn256/bn256_fuzz.go b/crypto/bn256/bn256_fuzz.go
index 585d509bf..b34043487 100644
--- a/crypto/bn256/bn256_fuzz.go
+++ b/crypto/bn256/bn256_fuzz.go
@@ -80,6 +80,12 @@ func FuzzMul(data []byte) int {
if remaining == 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)
input.Read(buf)
--
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