From 8a092572b5bd1329fb27209e9129841ed65ed859 Mon Sep 17 00:00:00 2001
From: rwatson <rwatson@FreeBSD.org>
Date: Sun, 19 Apr 2009 22:04:29 +0000
Subject: Lock interface address list when building a reply to
 NGM_EIFACE_GET_IFADDRS messages in ng_eiface.

MFC after:	2 weeks
---
 sys/netgraph/ng_eiface.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'sys/netgraph/ng_eiface.c')

diff --git a/sys/netgraph/ng_eiface.c b/sys/netgraph/ng_eiface.c
index 542eaad..eb638fe 100644
--- a/sys/netgraph/ng_eiface.c
+++ b/sys/netgraph/ng_eiface.c
@@ -452,10 +452,12 @@ ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 
 			/* Determine size of response and allocate it */
 			buflen = 0;
+			IF_ADDR_LOCK(ifp);
 			TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
 				buflen += SA_SIZE(ifa->ifa_addr);
 			NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
 			if (resp == NULL) {
+				IF_ADDR_UNLOCK(ifp);
 				error = ENOMEM;
 				break;
 			}
@@ -474,6 +476,7 @@ ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
 				ptr += len;
 				buflen -= len;
 			}
+			IF_ADDR_UNLOCK(ifp);
 			break;
 		    }
 
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