From: Robert Griesemer <gri@golang.org>
Date: Tue, 5 Jun 2018 23:29:06 +0000 (-0700)
Subject: cmd/compile: avoid nil pointer deref in debugging output
X-Git-Tag: go1.11beta1~210
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=409a943f69b27a329c523230ec83d0fef495c20a;p=gostls13.git

cmd/compile: avoid nil pointer deref in debugging output

Found while tracking down another issue.

Change-Id: If06eee72ce3e3f45dc00b3b68670e1e4d99c87a7
Reviewed-on: https://go-review.googlesource.com/116455
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
---

diff --git a/src/cmd/compile/internal/gc/fmt.go b/src/cmd/compile/internal/gc/fmt.go
index 598930bf15..75194ca6f0 100644
--- a/src/cmd/compile/internal/gc/fmt.go
+++ b/src/cmd/compile/internal/gc/fmt.go
@@ -1599,7 +1599,7 @@ func (n *Node) nodedump(s fmt.State, flag FmtFlag, mode fmtMode) {
 
 	case OTYPE:
 		mode.Fprintf(s, "%v %v%j type=%v", n.Op, n.Sym, n, n.Type)
-		if recur && n.Type == nil && n.Name.Param.Ntype != nil {
+		if recur && n.Type == nil && n.Name != nil && n.Name.Param != nil && n.Name.Param.Ntype != nil {
 			indent(s)
 			mode.Fprintf(s, "%v-ntype%v", n.Op, n.Name.Param.Ntype)
 		}