Re: [PATCH] net bridge: add null pointer check, fix panic

On Thu, 2013-06-20 at 11:08 +0800, xiaoming gao wrote:

From: newtongao <redacted>
Date: Wed, 19 Jun 2013 14:58:33 +0800
Subject: [PATCH] net bridge: add null pointer check,fix panic

in kernel 3.0, br_port_get_rcu() may return NULL when network interface be deleting from bridge,
but in function br_handle_frame and br_handle_local_finish, the pointer didn't be checked before using,
so all br_port_get_rcu callers must do null check,or there occurs the null pointer panic.

kernel 3.4 also has this bug,i have verified.
mainline kernel still did not  check br_port_get_rcu()'s NULL pointer, but i have not tested it yet.

Please check current version before sending a patch.

This was most probably fixed in commit 00cfec37484761a44
("net: add a synchronize_net() in netdev_rx_handler_unregister()")

Thanks