linux-kernel - [PATCH] IPROUTE: correct nla nested message generated by netem_parse

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Date:	Thu, 21 Aug 2008 17:50:11 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	shemminger@...tta.com
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [PATCH] IPROUTE: correct nla nested message generated by
	netem_parse_opt

From: Alexander Duyck <alexander.h.duyck@...el.com>

netem_parse_opt was generating a malformed nested compat message.  This patch
corrects it so that the nested arguments are contained within a nested nla
header.

Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 tc/q_netem.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/tc/q_netem.c b/tc/q_netem.c
index d06932e..a3365c1 100644
--- a/tc/q_netem.c
+++ b/tc/q_netem.c
@@ -128,7 +128,7 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 			   struct nlmsghdr *n)
 {
 	size_t dist_size = 0;
-	struct rtattr *tail;
+	struct rtattr *nest;
 	struct tc_netem_qopt opt;
 	struct tc_netem_corr cor;
 	struct tc_netem_reorder reorder;
@@ -257,8 +257,6 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 		argc--; argv++;
 	}
 
-	tail = NLMSG_TAIL(n);
-
 	if (reorder.probability) {
 		if (opt.latency == 0) {
 			fprintf(stderr, "reordering not possible without specifying some delay\n");
@@ -277,8 +275,7 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 		return -1;
 	}
 
-	if (addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt)) < 0)
-		return -1;
+	nest = addattr_nest_compat(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
 
 	if (present[TCA_NETEM_CORR] &&
 	    addattr_l(n, 1024, TCA_NETEM_CORR, &cor, sizeof(cor)) < 0)
@@ -299,7 +296,7 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 			return -1;
 		free(dist_data);
 	}
-	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
+	addattr_nest_compat_end(n, nest);
 	return 0;
 }
 

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