From 375b7bb76786ad61711771c7703f4c71b4489987 Mon Sep 17 00:00:00 2001
From: Keith Randall <khr@golang.org>
Date: Fri, 4 Apr 2014 12:58:19 -0700
Subject: [PATCH] cmd/gc: compute size of keys & values before making map
 bucket

Fixes #7547

LGTM=iant
R=iant, khr
CC=golang-codereviews
https://golang.org/cl/84470046
---
 src/cmd/gc/reflect.c        |  2 ++
 test/fixedbugs/issue7547.go | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 test/fixedbugs/issue7547.go

diff --git a/src/cmd/gc/reflect.c b/src/cmd/gc/reflect.c
index 3f4734ef528..75d7d8c1c80 100644
--- a/src/cmd/gc/reflect.c
+++ b/src/cmd/gc/reflect.c
@@ -125,6 +125,8 @@ mapbucket(Type *t)
 
 	keytype = t->down;
 	valtype = t->type;
+	dowidth(keytype);
+	dowidth(valtype);
 	if(keytype->width > MAXKEYSIZE)
 		keytype = ptrto(keytype);
 	if(valtype->width > MAXVALSIZE)
diff --git a/test/fixedbugs/issue7547.go b/test/fixedbugs/issue7547.go
new file mode 100644
index 00000000000..f75a33036fb
--- /dev/null
+++ b/test/fixedbugs/issue7547.go
@@ -0,0 +1,17 @@
+// compile
+
+// Copyright 2014 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
+
+func f() map[string]interface{} {
+	var p *map[string]map[string]interface{}
+	_ = p
+	return nil
+}
+
+func main() {
+	f()
+}