tests/fuzzers/rlp: avoid very large input (ethereum#25109)

holiman · blakehhuynh · commit e0760438e3d3 · 2022-10-07T09:59:47.000-07:00
The oss-fuzz engine crashes due to stack overflow decoding a large nested
structure into a interface{}. This PR limits the size of the input data, so
should avoid such crashes.
diff --git a/tests/fuzzers/rlp/rlp_fuzzer.go b/tests/fuzzers/rlp/rlp_fuzzer.go
@@ -40,6 +40,9 @@ func Fuzz(input []byte) int {
 	if len(input) == 0 {
 		return 0
 	}
+	if len(input) > 500*1024 {
+		return 0
+	}
 
 	var i int
 	{

Original file line number	Diff line number	Diff line change
`@@ -40,6 +40,9 @@ func Fuzz(input []byte) int {`
`40`	`40`	`if len(input) == 0 {`
`41`	`41`	`return 0`
`42`	`42`	`}`
	`43`	`+ if len(input) > 500*1024 {`
	`44`	`+ return 0`
	`45`	`+ }`
`43`	`46`
`44`	`47`	`var i int`
`45`	`48`	`{`