svn commit: r219828 - head/sys/netinet

[Sergey Kandaurov]

Author: pluknet
Date: Mon Mar 21 14:19:40 2011
New Revision: 219828
URL: http://svn.freebsd.org/changeset/base/219828

Log:
  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>
  Approved by:	avg (mentor)
  MFC after:	2 weeks

Modified:
  head/sys/netinet/in.c

Modified: head/sys/netinet/in.c
==============================================================================
--- head/sys/netinet/in.c	Mon Mar 21 14:18:40 2011	(r219827)
+++ head/sys/netinet/in.c	Mon Mar 21 14:19:40 2011	(r219828)
@@ -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);
 		}
 	}