Re: [PATCH v2] cgroup: fix panic in netprio_cgroup

[David Miller]

From: Gao feng <gaofeng@xxxxxxxxxxxxxx>
Date: Thu, 5 Jul 2012 17:28:40 +0800

> we set max_prioidx to the first zero bit index of prioidx_map in
> function get_prioidx.
> 
> So when we delete the low index netprio cgroup and adding a new
> netprio cgroup again,the max_prioidx will be set to the low index.
> 
> when we set the high index cgroup's net_prio.ifpriomap,the function
> write_priomap will call update_netdev_tables to alloc memory which
> size is sizeof(struct netprio_map) + sizeof(u32) * (max_prioidx + 1),
> so the size of array that map->priomap point to is max_prioidx +1,
> which is low than what we actually need.
> 
> fix this by adding check in get_prioidx,only set max_prioidx when
> max_prioidx low than the new prioidx.
> 
> Signed-off-by: Gao feng <gaofeng@xxxxxxxxxxxxxx>

Applied.
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