From 44f6033c48968945353109af69114b5d0a1700de Mon Sep 17 00:00:00 2001
From: Jhon Honce <jhonce@redhat.com>
Date: Fri, 11 Oct 2019 16:08:59 -0700
Subject: [PATCH] Check for both nil and zero length

Signed-off-by: Jhon Honce <jhonce@redhat.com>
---
 libcontainer/generic_error.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libcontainer/generic_error.go b/libcontainer/generic_error.go
index de37715c..0f90369b 100644
--- a/runc-66aedde759f33c190954815fb765eedc1d782dd9/libcontainer/generic_error.go
+++ b/runc-66aedde759f33c190954815fb765eedc1d782dd9/libcontainer/generic_error.go
@@ -93,6 +93,10 @@ func (e *genericError) Error() string {
 	if e.Cause == "" {
 		return e.Message
 	}
+
+	if len(e.Stack.Frames) == 0 {
+		return fmt.Sprintf("<unknown>:<unknown>: %s caused %q", e.Cause, e.Message)
+	}
 	frame := e.Stack.Frames[0]
 	return fmt.Sprintf("%s:%d: %s caused %q", frame.File, frame.Line, e.Cause, e.Message)
 }