netdev - Re: [PATCH net-next] bpf: fix numa

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Message-Id: <20170905.091027.204977527174006202.davem@davemloft.net>
Date:   Tue, 05 Sep 2017 09:10:27 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org, kafai@...com, daniel@...earbox.net,
        ast@...com
Subject: Re: [PATCH net-next] bpf: fix numa_node validation

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 04 Sep 2017 22:41:02 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> syzkaller reported crashes in bpf map creation or map update [1]
> 
> Problem is that nr_node_ids is a signed integer,
> NUMA_NO_NODE is also an integer, so it is very tempting
> to declare numa_node as a signed integer.
> 
> This means the typical test to validate a user provided value :
> 
>         if (numa_node != NUMA_NO_NODE &&
>             (numa_node >= nr_node_ids ||
>              !node_online(numa_node)))
> 
> must be written :
> 
>         if (numa_node != NUMA_NO_NODE &&
>             ((unsigned int)numa_node >= nr_node_ids ||
>              !node_online(numa_node)))
> 
> 
> [1]
 ...
> Fixes: 96eabe7a40aa ("bpf: Allow selecting numa node during map creation")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks.