>Number:         24107
>Category:       port-i386
>Synopsis:       null dereference in intr_find_pcibridge()
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jan 15 11:35:00 UTC 2004
>Closed-Date:
>Last-Modified:
>Originator:     YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
>Release:        NetBSD 1.6ZG
>Organization:

>Environment:
	
	
System: NetBSD kaeru 1.6ZG NetBSD 1.6ZG (build.kaeru) #713: Wed Jan 14 21:10:12 JST 2004 takashi@kaeru:/home/takashi/work/kernel/build.kaeru i386
Architecture: i386
Machine: i386
>Description:
	intr_find_pcibridge() assumes that busses on intr_extra_buses
	have non null bridgetag.  however, it isn't the case for
	pchb's second pci busses.
>How-To-Repeat:
	
>Fix:

Index: intr.c
===================================================================
--- intr.c	(revision 425)
+++ intr.c	(working copy)
@@ -233,6 +233,8 @@ intr_find_pcibridge(int bus, pcitag_t *p
 
 	LIST_FOREACH(iebp, &intr_extra_buses, list) {
 		if (iebp->bus == bus) {
+			if (iebp->pci_bridge_tag == NULL)
+				return ENOENT;
 			*pci_bridge_tag = *iebp->pci_bridge_tag;
 			*pci_chipset_tag = iebp->pci_chipset_tag;
 			return 0;
>Release-Note:
>Audit-Trail:
>Unformatted: