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From: Sergey Kandaurov <pluknet@FreeBSD.org>
Date: Mon, 4 Apr 2011 09:56:10 +0000 (UTC)
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Subject: svn commit: r220322 - stable/8/sys/netinet
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Author: pluknet
Date: Mon Apr  4 09:56:10 2011
New Revision: 220322
URL: http://svn.freebsd.org/changeset/base/220322

Log:
  MFC r219828:
  
   Reference ifaddr object before unlocking as it can be freed
   from another context at the moment of later access.
  
  PR:		kern/155555
  Submitted by:	Andrew Boyer <aboyer att averesystems.com>

Modified:
  stable/8/sys/netinet/in.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/netinet/in.c
==============================================================================
--- stable/8/sys/netinet/in.c	Mon Apr  4 09:38:05 2011	(r220321)
+++ stable/8/sys/netinet/in.c	Mon Apr  4 09:56:10 2011	(r220322)
@@ -1174,8 +1174,8 @@ in_scrubprefix(struct in_ifaddr *target)
 		 *      doesn't support such action.
 		 */
 		if ((ia->ia_flags & IFA_ROUTE) == 0
-		    && (ia->ia_ifp->if_type != IFT_CARP)
-							) {
+		    && (ia->ia_ifp->if_type != IFT_CARP)) {
+			ifa_ref(&ia->ia_ifa);
 			IN_IFADDR_RUNLOCK();
 			rtinit(&(target->ia_ifa), (int)RTM_DELETE,
 			    rtinitflags(target));
@@ -1185,6 +1185,7 @@ in_scrubprefix(struct in_ifaddr *target)
 			    rtinitflags(ia) | RTF_UP);
 			if (error == 0)
 				ia->ia_flags |= IFA_ROUTE;
+			ifa_free(&ia->ia_ifa);
 			return (error);
 		}
 	}