linux-kernel - [PATCH 4.9 20/59] drop_monitor: consider inserted data in genlmsg

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Message-Id: <20170113113840.134276458@linuxfoundation.org>
Date:   Fri, 13 Jan 2017 13:01:27 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Reiter Wolfgang <wr0112358@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 20/59] drop_monitor: consider inserted data in genlmsg_end

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Reiter Wolfgang <wr0112358@...il.com>


[ Upstream commit 3b48ab2248e61408910e792fe84d6ec466084c1a ]

Final nlmsg_len field update must reflect inserted net_dm_drop_point
data.

This patch depends on previous patch:
"drop_monitor: add missing call to genlmsg_end"

Signed-off-by: Reiter Wolfgang <wr0112358@...il.com>
Acked-by: Neil Horman <nhorman@...driver.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/drop_monitor.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/net/core/drop_monitor.c
+++ b/net/core/drop_monitor.c
@@ -107,7 +107,6 @@ static struct sk_buff *reset_per_cpu_dat
 	}
 	msg = nla_data(nla);
 	memset(msg, 0, al);
-	genlmsg_end(skb, msg_header);
 	goto out;
 
 err:
@@ -117,6 +116,13 @@ out:
 	swap(data->skb, skb);
 	spin_unlock_irqrestore(&data->lock, flags);
 
+	if (skb) {
+		struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
+		struct genlmsghdr *gnlh = (struct genlmsghdr *)nlmsg_data(nlh);
+
+		genlmsg_end(skb, genlmsg_data(gnlh));
+	}
+
 	return skb;
 }