Date: Sat, 30 Oct 2010 11:30:50 +0000 (UTC) From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org Subject: svn commit: r214551 - stable/7/sys/net Message-ID: <201010301130.o9UBUogA095443@svn.freebsd.org>
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Author: bz Date: Sat Oct 30 11:30:49 2010 New Revision: 214551 URL: http://svn.freebsd.org/changeset/base/214551 Log: MFC r213930: Close a race acquiring the IF_ADDR_LOCK() for each entry while iterating over all interfaces to make sure the address will neither change nor be freed while we are working on it. PR: kern/146250 Submitted by: Mikolaj Golub (to.my.trociny gmail.com) Modified: stable/7/sys/net/rtsock.c Directory Properties: stable/7/sys/ (props changed) stable/7/sys/cddl/contrib/opensolaris/ (props changed) stable/7/sys/contrib/dev/acpica/ (props changed) stable/7/sys/contrib/pf/ (props changed) Modified: stable/7/sys/net/rtsock.c ============================================================================== --- stable/7/sys/net/rtsock.c Sat Oct 30 10:38:23 2010 (r214550) +++ stable/7/sys/net/rtsock.c Sat Oct 30 11:30:49 2010 (r214551) @@ -1261,6 +1261,7 @@ sysctl_iflist(int af, struct walkarg *w) TAILQ_FOREACH(ifp, &ifnet, if_link) { if (w->w_arg && w->w_arg != ifp->if_index) continue; + IF_ADDR_LOCK(ifp); ifa = ifp->if_addr; info.rti_info[RTAX_IFP] = ifa->ifa_addr; len = rt_msg2(RTM_IFINFO, &info, NULL, w); @@ -1300,10 +1301,13 @@ sysctl_iflist(int af, struct walkarg *w) goto done; } } + IF_ADDR_UNLOCK(ifp); info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] = info.rti_info[RTAX_BRD] = NULL; } done: + if (ifp != NULL) + IF_ADDR_UNLOCK(ifp); IFNET_RUNLOCK(); return (error); }
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