obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 37 insertions, 0 deletions

diff --git a/gcc/testsuite/go.test/test/nilptr/arraytoslice.go b/gcc/testsuite/go.test/test/nilptr/arraytoslice.go
new file mode 100644
index 000000000..38206d50b
--- /dev/null
+++ b/gcc/testsuite/go.test/test/nilptr/arraytoslice.go
@@ -0,0 +1,37 @@
+// [ $GOOS != nacl ] || exit 0  # do not bother on NaCl
+// $G $D/$F.go && $L $F.$A &&
+//	((! sh -c ./$A.out) >/dev/null 2>&1 || echo BUG: should fail)
+
+// Copyright 2009 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 "unsafe"
+
+func f([]byte) {
+	panic("unreachable")
+}
+
+var dummy [512<<20]byte	// give us a big address space
+func main() {
+	// the test only tests what we intend to test
+	// if dummy starts in the first 256 MB of memory.
+	// otherwise there might not be anything mapped
+	// at the address that might be accidentally
+	// dereferenced below.
+	if uintptr(unsafe.Pointer(&dummy)) > 256<<20 {
+		panic("dummy too far out")
+	}
+
+	// The problem here is that indexing into p[] with a large
+	// enough index can jump out of the unmapped section
+	// at the beginning of memory and into valid memory.
+	//
+	// To avoid needing a check on every slice beyond the
+	// usual len and cap, we require the *array -> slice
+	// conversion to do the check.
+	var p *[1<<30]byte = nil
+	f(p[0:])	// should crash
+}