internal/trace: fix fuzzer crashers

Fixes #11766
Fixes #11769
Fixes #11767
Fixes #11770

Change-Id: I441382af58f60deb46dcdd70076763b2c47738d4
Reviewed-on: https://go-review.googlesource.com/12378
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/src/internal/trace/parser_test.go b/src/internal/trace/parser_test.go
new file mode 100644
index 0000000000..7d066e86fe
--- /dev/null
+++ b/src/internal/trace/parser_test.go
@@ -0,0 +1,26 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package trace
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestCorruptedInputs(t *testing.T) {
+	// These inputs crashed parser previously.
+	tests := []string{
+		"gotrace\x00\x020",
+		"gotrace\x00Q00\x020",
+		"gotrace\x00T00\x020",
+		"gotrace\x00\xc3\x0200",
+	}
+	for _, data := range tests {
+		events, err := Parse(strings.NewReader(data))
+		if err == nil || events != nil {
+			t.Fatalf("no error on input: %q\n", t)
+		}
+	}
+}