Date: Mon, 24 May 2010 17:12:44 +0000 (UTC) From: Pyun YongHyeon <yongari@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r208512 - head/sys/dev/sge Message-ID: <201005241712.o4OHCiLv062562@svn.freebsd.org>
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Author: yongari Date: Mon May 24 17:12:44 2010 New Revision: 208512 URL: http://svn.freebsd.org/changeset/base/208512 Log: sge_encap() can sometimes return an error with m_head set to NULL. Make sure not to requeue freed mbuf in sge_start_locked(). This should fix NULL pointer dereference panic. Reported by: Nikolay Denev <ndenev <> gmail dot com> Submitted by: jhb Modified: head/sys/dev/sge/if_sge.c Modified: head/sys/dev/sge/if_sge.c ============================================================================== --- head/sys/dev/sge/if_sge.c Mon May 24 16:42:55 2010 (r208511) +++ head/sys/dev/sge/if_sge.c Mon May 24 17:12:44 2010 (r208512) @@ -1588,7 +1588,8 @@ sge_start_locked(struct ifnet *ifp) if (m_head == NULL) break; if (sge_encap(sc, &m_head)) { - IFQ_DRV_PREPEND(&ifp->if_snd, m_head); + if (m_head != NULL) + IFQ_DRV_PREPEND(&ifp->if_snd, m_head); ifp->if_drv_flags |= IFF_DRV_OACTIVE; break; }
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