netdev - Re: [PATCH net-next] fix NULL pointer dereference in br_handle

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Message-ID: <1378996396.24408.8.camel@edumazet-glaptop>
Date:	Thu, 12 Sep 2013 07:33:16 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hong zhi guo <honkiko@...il.com>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	zhiguohong@...cent.com
Subject: Re: [PATCH net-next] fix NULL pointer dereference in br_handle_frame

On Thu, 2013-09-12 at 22:24 +0800, Hong zhi guo wrote:
> You mean IFF_BRIDGE_PORT should be only for admin/control path, but
> not for data path?

By definition, br_handle_frame() should be called only when device is a
bridge port.

After the call to synchronize_net() included in
netdev_rx_handler_unregister(), you have guarantee br_handle_frame()
wont be called.

Therefore, testing IFF_BRIDGE_PORT in br_handle_frame() is redundant.



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