From 0f8da8a15e33a886f10658bba0188b192ee45d77 Mon Sep 17 00:00:00 2001
From: riastradh <riastradh@NetBSD.org>
Date: Tue, 11 Apr 2023 08:50:07 +0000
Subject: [PATCH] usb(9): Assert ud_ifaces is null before we clobber it.

---
 sys/dev/usb/usb_subr.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/dev/usb/usb_subr.c b/sys/dev/usb/usb_subr.c
index 03773fabf19e..e14fec7e30be 100644
--- a/sys/dev/usb/usb_subr.c
+++ b/sys/dev/usb/usb_subr.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: usb_subr.c,v 1.277 2022/04/06 22:01:45 mlelstv Exp $	*/
+/*	$NetBSD: usb_subr.c,v 1.278 2023/04/11 08:50:07 riastradh Exp $	*/
 /*	$FreeBSD: src/sys/dev/usb/usb_subr.c,v 1.18 1999/11/17 22:33:47 n_hibma Exp $	*/
 
 /*
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: usb_subr.c,v 1.277 2022/04/06 22:01:45 mlelstv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: usb_subr.c,v 1.278 2023/04/11 08:50:07 riastradh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_compat_netbsd.h"
@@ -867,6 +867,8 @@ usbd_set_config_index(struct usbd_device *dev, int index, int msg)
 		goto bad;
 	}
 
+	KASSERTMSG(dev->ud_ifaces == NULL, "ud_ifaces=%p", dev->ud_ifaces);
+
 	/* Allocate and fill interface data. */
 	nifc = cdp->bNumInterface;
 	if (nifc == 0) {