From f177e00aefa49df572914fc061dd191e1b6e25f3 Mon Sep 17 00:00:00 2001
From: Mitchell Horne <mhorne@FreeBSD.org>
Date: Sat, 15 Oct 2022 15:43:53 -0300
Subject: [PATCH] kern_intr: Check for NULL event in intr_destroy()

It likely won't happen, but is consistent with the other functions of
this KPI.

Reviewed by:	imp, jhb
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D33479

(cherry picked from commit 39888ed7a3dca81c5d5c886e699dbcf58953137f)
---
 sys/kern/kern_intr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c
index 449ae224bbe..29e88ff42ae 100644
--- a/sys/kern/kern_intr.c
+++ b/sys/kern/kern_intr.c
@@ -505,6 +505,9 @@ int
 intr_event_destroy(struct intr_event *ie)
 {
 
+	if (ie == NULL)
+		return (EINVAL);
+
 	mtx_lock(&event_lock);
 	mtx_lock(&ie->ie_lock);
 	if (!CK_SLIST_EMPTY(&ie->ie_handlers)) {