only write headers with a length that fits into 2 bytes in fuzz test

marten-seemann · marten-seemann · commit f0aa336e093c · 2020-11-19T13:43:48.000+07:00
diff --git a/fuzzing/header/fuzz.go b/fuzzing/header/fuzz.go
@@ -48,6 +48,11 @@ func Fuzz(data []byte) int {
 			return 0
 		}
 	}
+	// We always use a 2-byte encoding for the Length field in Long Header packets.
+	// Serializing the header will fail when using a higher value.
+	if hdr.IsLongHeader && hdr.Length > 16383 {
+		return 1
+	}
 	b := &bytes.Buffer{}
 	if err := extHdr.Write(b, version); err != nil {
 		// We are able to parse packets with connection IDs longer than 20 bytes,

Original file line number	Diff line number	Diff line change
`@@ -48,6 +48,11 @@ func Fuzz(data []byte) int {`
`48`	`48`	`return 0`
`49`	`49`	`}`
`50`	`50`	`}`
	`51`	`+ // We always use a 2-byte encoding for the Length field in Long Header packets.`
	`52`	`+ // Serializing the header will fail when using a higher value.`
	`53`	`+ if hdr.IsLongHeader && hdr.Length > 16383 {`
	`54`	`+ return 1`
	`55`	`+ }`
`51`	`56`	`b := &bytes.Buffer{}`
`52`	`57`	`if err := extHdr.Write(b, version); err != nil {`
`53`	`58`	`// We are able to parse packets with connection IDs longer than 20 bytes,`