From b48c608386bc54ce249eb1b031894edcf08d79b3 Mon Sep 17 00:00:00 2001
From: Andrew Turner <andrew@FreeBSD.org>
Date: Mon, 9 May 2016 12:24:39 +0000
Subject: [PATCH] Check malloc succeeded in pic_create, with M_NOWAIT it may
 return NULL.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
---
 sys/kern/subr_intr.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/kern/subr_intr.c b/sys/kern/subr_intr.c
index 98e8e387106b..9b92e7314f60 100644
--- a/sys/kern/subr_intr.c
+++ b/sys/kern/subr_intr.c
@@ -871,6 +871,10 @@ pic_create(device_t dev, intptr_t xref)
 		return (pic);
 	}
 	pic = malloc(sizeof(*pic), M_INTRNG, M_NOWAIT | M_ZERO);
+	if (pic == NULL) {
+		mtx_unlock(&pic_list_lock);
+		return (NULL);
+	}
 	pic->pic_xref = xref;
 	pic->pic_dev = dev;
 	SLIST_INSERT_HEAD(&pic_list, pic, pic_next);