From ac33157c37e293a832ae2ff75686353edfc2b471 Mon Sep 17 00:00:00 2001
From: Giacomo Tesio <giacomo@tesio.it>
Date: Tue, 25 Apr 2017 16:07:47 +0200
Subject: [PATCH] kern: usbehcipc.c fix CID 155940: Out-of-bounds write

---
 sys/src/kern/amd64/usbehcipc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/src/kern/amd64/usbehcipc.c b/sys/src/kern/amd64/usbehcipc.c
index 036d4e6..6e01a20 100644
--- a/sys/src/kern/amd64/usbehcipc.c
+++ b/sys/src/kern/amd64/usbehcipc.c
@@ -209,7 +209,8 @@ scanpci(void)
 		if (i >= maxehci) {
 			iprint("usbehci: ignoring controllers after first %d, "
 				"at %#p\n", maxehci, io);
-			ctlrs[i] = nil;
+			if(i < Nhcis)
+				ctlrs[i] = nil;
 		}
 	}
 }