Commit 59ccaaaa authored Jan 28, 2015 by Roopa Prabhu Committed by David S. Miller Jan 28, 2015

bridge: dont send notification when skb->len == 0 in rtnl_bridge_notify

Reported in: https://bugzilla.kernel.org/show_bug.cgi?id=92081



This patch avoids calling rtnl_notify if the device ndo_bridge_getlink
handler does not return any bytes in the skb.

Alternately, the skb->len check can be moved inside rtnl_notify.

For the bridge vlan case described in 92081, there is also a fix needed
in bridge driver to generate a proper notification. Will fix that in
subsequent patch.

v2: rebase patch on net tree

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 95224ac1

net/core/rtnetlink.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -2895,11 +2895,15 @@ static int rtnl_bridge_notify(struct net_device *dev, u16 flags)
		goto errout;
		}

		if (!skb->len)
		goto errout;

		rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
		return 0;
		errout:
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		if (err)
		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
		return err;
		}