From faadda040d49c581a82fc459c34186c8bff58a2b Mon Sep 17 00:00:00 2001
From: Roberto Clapis <robclap8@gmail.com>
Date: Thu, 2 Aug 2018 15:27:14 +0200
Subject: [PATCH] os: add check for empty executable path on darwin

os used to panic (access out of bounds) if executablePath was left empty

Fixes #22529

Change-Id: Iead5e60a3b000dbde421a8e8612c3690340879ce
Reviewed-on: https://go-review.googlesource.com/127546
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
---
 src/os/executable_darwin.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/os/executable_darwin.go b/src/os/executable_darwin.go
index ce5b8140a4..dae9f4ee18 100644
--- a/src/os/executable_darwin.go
+++ b/src/os/executable_darwin.go
@@ -4,12 +4,17 @@
 
 package os
 
+import "errors"
+
 var executablePath string // set by ../runtime/os_darwin.go
 
 var initCwd, initCwdErr = Getwd()
 
 func executable() (string, error) {
 	ep := executablePath
+	if len(ep) == 0 {
+		return ep, errors.New("cannot find executable path")
+	}
 	if ep[0] != '/' {
 		if initCwdErr != nil {
 			return ep, initCwdErr
-- 
2.50.0