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Fix NULL deref, to prevent kernel crashes when detaching an udsbr0 device.

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This commit is contained in:
maxv 2019-09-14 12:50:16 +00:00
parent 146bab28ab
commit f1f5729782
1 changed files with 5 additions and 4 deletions
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9
sys/dev/usb/udsbr.c
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@ -1,4 +1,4 @@
/* $NetBSD: udsbr.c,v 1.27 2019/05/05 03:17:54 mrg Exp $ */
/* $NetBSD: udsbr.c,v 1.28 2019/09/14 12:50:16 maxv Exp $ */
/*
* Copyright (c) 2002 The NetBSD Foundation, Inc.
@ -38,7 +38,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: udsbr.c,v 1.27 2019/05/05 03:17:54 mrg Exp $");
__KERNEL_RCSID(0, "$NetBSD: udsbr.c,v 1.28 2019/09/14 12:50:16 maxv Exp $");
#ifdef _KERNEL_OPT
#include "opt_usb.h"
@ -174,8 +174,9 @@ udsbr_detach(device_t self, int flags)
if (sc->sc_child != NULL)
rv = config_detach(sc->sc_child, flags);
usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev);
if (sc->sc_udev != NULL)
usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
sc->sc_dev);
return rv;
}