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

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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>
This commit is contained in:
Roopa Prabhu 2015-01-28 16:23:11 -08:00 committed by David S. Miller
parent 95224ac180
commit 59ccaaaa49
1 changed files with 5 additions and 1 deletions
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6
net/core/rtnetlink.c
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@ -2895,12 +2895,16 @@ 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);
rtnl_set_sk_err(net, RTNLGRP_LINK, err);
if (err)
rtnl_set_sk_err(net, RTNLGRP_LINK, err);
return err;
}