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In device_is_a(), handle dev or dev->dv_cfdriver being NULL. This 

makes the calling pattern:

	device_is_a(device_parent(dev), "whatever")

safe.
This commit is contained in:
thorpej 2021-01-28 15:53:46 +00:00
parent e225d1d2cf
commit 37a8d677a1
1 changed files with 5 additions and 2 deletions
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7
sys/kern/subr_device.c
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@ -1,4 +1,4 @@
/* $NetBSD: subr_device.c,v 1.3 2015/03/09 15:35:11 pooka Exp $ */
/* $NetBSD: subr_device.c,v 1.4 2021/01/28 15:53:46 thorpej Exp $ */
/*
* Copyright (c) 2006 The NetBSD Foundation, Inc.
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_device.c,v 1.3 2015/03/09 15:35:11 pooka Exp $");
__KERNEL_RCSID(0, "$NetBSD: subr_device.c,v 1.4 2021/01/28 15:53:46 thorpej Exp $");
#include <sys/param.h>
#include <sys/device.h>
@ -176,6 +176,9 @@ device_properties(device_t dev)
bool
device_is_a(device_t dev, const char *dname)
{
if (dev == NULL || dev->dv_cfdriver == NULL) {
return false;
}
return strcmp(dev->dv_cfdriver->cd_name, dname) == 0;
}