1 files changed, 53 insertions, 0 deletions
diff --git a/test/fixedbugs/issue28797.go b/test/fixedbugs/issue28797.go
new file mode 100644
index 0000000..480c105
--- /dev/null
+++ b/test/fixedbugs/issue28797.go
@@ -0,0 +1,53 @@
+// run
+
+// Copyright 2018 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 main
+
+import (
+	"fmt"
+)
+
+// test expects f to panic, but not to run out of memory,
+// which is a non-panic fatal error.  OOM results from failure
+// to properly check negative limit.
+func test(f func()) {
+	defer func() {
+		r := recover()
+		if r == nil {
+			panic("panic wasn't recoverable")
+		}
+	}()
+	f()
+}
+
+//go:noinline
+func id(x int) int {
+	return x
+}
+
+func main() {
+	test(foo)
+	test(bar)
+}
+
+func foo() {
+	b := make([]byte, 0)
+	b = append(b, 1)
+	id(len(b))
+	id(len(b) - 2)
+	s := string(b[1 : len(b)-2])
+	fmt.Println(s)
+}
+
+func bar() {
+	b := make([]byte, 1)
+	b = append(b, 1)
+	i := id(-1)
+	if i < len(b) { // establish value is not too large.
+		s := string(b[1:i]) // should check for negative also.
+		fmt.Println(s)
+	}
+}