From 00ff4beaa76fb3dde4d1222408d1308f4077dde1 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Tue, 31 Dec 2013 07:29:55 +0100
Subject: kernel: check for error label stack underflow in nexterror()

---
 sys/src/9/port/proc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/src/9/port/proc.c b/sys/src/9/port/proc.c
index 8f3817b57..41cfb9aff 100644
--- a/sys/src/9/port/proc.c
+++ b/sys/src/9/port/proc.c
@@ -1467,6 +1467,7 @@ error(char *err)
 void
 nexterror(void)
 {
+	assert(up->nerrlab > 0);
 	gotolabel(&up->errlab[--up->nerrlab]);
 }
 
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