From bf9363d72cf3c04da8385101441b37a9a9c20754 Mon Sep 17 00:00:00 2001
From: Navdeep Parhar <np@FreeBSD.org>
Date: Fri, 1 Jul 2016 23:18:49 +0000
Subject: [PATCH] cxgbe(4): Avoid a NULL dereference while dumping the L2
 table.  Entries used by switching filters that rewrite L2 information do not
 have any associated ifnet.

Approved by:	re@ (gjb@)
Sponsored by:	Chelsio Communications
---
 sys/dev/cxgbe/t4_l2t.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sys/dev/cxgbe/t4_l2t.c b/sys/dev/cxgbe/t4_l2t.c
index cab5cc28ce8..7c4cedefb28 100644
--- a/sys/dev/cxgbe/t4_l2t.c
+++ b/sys/dev/cxgbe/t4_l2t.c
@@ -307,7 +307,6 @@ sysctl_l2t(SYSCTL_HANDLER_ARGS)
 		}
 
 		/*
-		 * XXX: e->ifp may not be around.
 		 * XXX: IPv6 addresses may not align properly in the output.
 		 */
 		sbuf_printf(sb, "\n%4u %-15s %02x:%02x:%02x:%02x:%02x:%02x %4d"
@@ -316,7 +315,7 @@ sysctl_l2t(SYSCTL_HANDLER_ARGS)
 			   e->dmac[3], e->dmac[4], e->dmac[5],
 			   e->vlan & 0xfff, vlan_prio(e), e->lport,
 			   l2e_state(e), atomic_load_acq_int(&e->refcnt),
-			   e->ifp->if_xname);
+			   e->ifp ? e->ifp->if_xname : "-");
 skip:
 		mtx_unlock(&e->lock);
 	}