From c2b06ebf8006a3ec8ebf36f12d800f23e4e79cdb Mon Sep 17 00:00:00 2001
From: Giacomo Tesio <giacomo@tesio.it>
Date: Sun, 22 Jan 2017 00:34:17 +0100
Subject: [PATCH] kernel: fix out of bound read in trap()

Reported by coverity, CID 155927: if vno == 32 it would access index
32 of excname at trap.c:339.
---
 sys/src/kern/amd64/trap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/src/kern/amd64/trap.c b/sys/src/kern/amd64/trap.c
index 646df15..c3da721 100644
--- a/sys/src/kern/amd64/trap.c
+++ b/sys/src/kern/amd64/trap.c
@@ -332,7 +332,7 @@ trap(Ureg* ureg)
 				preempted();
 		}
 	}
-	else if(vno <= nelem(excname) && user){
+	else if(vno < nelem(excname) && user){
 		spllo();
 		if(vno == 0xd)	/* General Protection */
 			dumpregs(ureg);