From owner-svn-src-head@FreeBSD.ORG Fri May 2 16:24:09 2014 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id DE5005F0; Fri, 2 May 2014 16:24:09 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id CBB001E42; Fri, 2 May 2014 16:24:09 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.8/8.14.8) with ESMTP id s42GO9nO034948; Fri, 2 May 2014 16:24:09 GMT (envelope-from asomers@svn.freebsd.org) Received: (from asomers@localhost) by svn.freebsd.org (8.14.8/8.14.8/Submit) id s42GO9Hi034947; Fri, 2 May 2014 16:24:09 GMT (envelope-from asomers@svn.freebsd.org) Message-Id: <201405021624.s42GO9Hi034947@svn.freebsd.org> From: Alan Somers Date: Fri, 2 May 2014 16:24:09 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r265232 - head/sys/net X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 May 2014 16:24:09 -0000 Author: asomers Date: Fri May 2 16:24:09 2014 New Revision: 265232 URL: http://svnweb.freebsd.org/changeset/base/265232 Log: Fix a panic caused by doing "ifconfig -am" while a lagg is being destroyed. The thread that is destroying the lagg has already set sc->sc_psc=NULL when the "ifconfig -am" thread gets to lacp_req(). It tries to dereference sc->sc_psc and panics. The solution is for lacp_req() to check the value of sc->sc_psc. If NULL, harmlessly return an lacp_opreq structure full of zeros. Full details in GNATS. PR: kern/189003 Reviewed by: timeout on freebsd-net@ MFC after: 3 weeks Sponsored by: Spectra Logic Corporation Modified: head/sys/net/ieee8023ad_lacp.c Modified: head/sys/net/ieee8023ad_lacp.c ============================================================================== --- head/sys/net/ieee8023ad_lacp.c Fri May 2 16:15:34 2014 (r265231) +++ head/sys/net/ieee8023ad_lacp.c Fri May 2 16:24:09 2014 (r265232) @@ -590,10 +590,20 @@ lacp_req(struct lagg_softc *sc, caddr_t { struct lacp_opreq *req = (struct lacp_opreq *)data; struct lacp_softc *lsc = LACP_SOFTC(sc); - struct lacp_aggregator *la = lsc->lsc_active_aggregator; + struct lacp_aggregator *la; - LACP_LOCK(lsc); bzero(req, sizeof(struct lacp_opreq)); + + /* + * If the LACP softc is NULL, return with the opreq structure full of + * zeros. It is normal for the softc to be NULL while the lagg is + * being destroyed. + */ + if (NULL == lsc) + return; + + la = lsc->lsc_active_aggregator; + LACP_LOCK(lsc); if (la != NULL) { req->actor_prio = ntohs(la->la_actor.lip_systemid.lsi_prio); memcpy(&req->actor_mac, &la->la_actor.lip_systemid.lsi_mac,