Date: Tue, 23 Feb 2021 13:55:07 GMT From: Kristof Provost <kp@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: c139b3c19b52 - main - arp/nd: Cope with late calls to iflladdr_event Message-ID: <202102231355.11NDt7RP017764@gitrepo.freebsd.org>
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The branch main has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=c139b3c19b52abe3b5ba23a8175e58e70c7a528d commit c139b3c19b52abe3b5ba23a8175e58e70c7a528d Author: Kristof Provost <kp@FreeBSD.org> AuthorDate: 2021-02-22 07:19:43 +0000 Commit: Kristof Provost <kp@FreeBSD.org> CommitDate: 2021-02-23 12:54:07 +0000 arp/nd: Cope with late calls to iflladdr_event When tearing down vnet jails we can move an if_bridge out (as part of the normal vnet_if_return()). This can, when it's clearing out its list of member interfaces, change its link layer address. That sends an iflladdr_event, but at that point we've already freed the AF_INET/AF_INET6 if_afdata pointers. In other words: when the iflladdr_event callbacks fire we can't assume that ifp->if_afdata[AF_INET] will be set. Reviewed by: donner@, melifaro@ MFC after: 1 week Sponsored by: Orange Business Services Differential Revision: https://reviews.freebsd.org/D28860 --- sys/netinet/if_ether.c | 4 ++++ sys/netinet6/nd6.c | 2 ++ 2 files changed, 6 insertions(+) diff --git a/sys/netinet/if_ether.c b/sys/netinet/if_ether.c index e09ad3d47382..ef50ec9ca964 100644 --- a/sys/netinet/if_ether.c +++ b/sys/netinet/if_ether.c @@ -1479,6 +1479,10 @@ arp_handle_ifllchange(struct ifnet *ifp) static void arp_iflladdr(void *arg __unused, struct ifnet *ifp) { + /* if_bridge can update its lladdr during if_vmove(), after we've done + * if_detach_internal()/dom_ifdetach(). */ + if (ifp->if_afdata[AF_INET] == NULL) + return; lltable_update_ifaddr(LLTABLE(ifp)); diff --git a/sys/netinet6/nd6.c b/sys/netinet6/nd6.c index 497c0bfc10e8..62f0ac733a23 100644 --- a/sys/netinet6/nd6.c +++ b/sys/netinet6/nd6.c @@ -208,6 +208,8 @@ nd6_lle_event(void *arg __unused, struct llentry *lle, int evt) static void nd6_iflladdr(void *arg __unused, struct ifnet *ifp) { + if (ifp->if_afdata[AF_INET6] == NULL) + return; lltable_update_ifaddr(LLTABLE6(ifp)); }
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