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Date:   Fri, 30 Sep 2016 19:41:52 +0200
From:   Pablo Neira Ayuso <>
To:     Aaron Conole <>
        Florian Westphal <>
Subject: Re: [PATCH nf-next v4 1/2] netfilter: Fix potential null pointer

On Wed, Sep 28, 2016 at 11:35:14AM -0400, Aaron Conole wrote:
> It's possible for nf_hook_entry_head to return NULL.  If two
> nf_unregister_net_hook calls happen simultaneously with a single hook
> entry in the list, both will enter the nf_hook_mutex critical section.
> The first will successfully delete the head, but the second will see
> this NULL pointer and attempt to dereference.
> This fix ensures that no null pointer dereference could occur when such
> a condition happens.

Applied, thanks Aaron.

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