netdev - Re: [PATCH nf] netfilter: nf_tables: free flowtable hooks on hook register error

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Message-ID: <20200305122855.GJ979@breakpoint.cc>
Date:   Thu, 5 Mar 2020 13:28:55 +0100
From:   Florian Westphal <fw@...len.de>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Florian Westphal <fw@...len.de>, netfilter-devel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, netdev@...r.kernel.org,
        syzbot+a2ff6fa45162a5ed4dd3@...kaller.appspotmail.com
Subject: Re: [PATCH nf] netfilter: nf_tables: free flowtable hooks on hook
 register error

Pablo Neira Ayuso <pablo@...filter.org> wrote:
> On Mon, Mar 02, 2020 at 09:58:50PM +0100, Florian Westphal wrote:
> > If hook registration fails, the hooks allocated via nft_netdev_hook_alloc
> > need to be freed.
> > 
> > We can't change the goto label to 'goto 5' -- while it does fix the memleak
> > it does cause a warning splat from the netfilter core (the hooks were not
> > registered).
> 
> It seems test/shell crashes after this, looking. It works after
> reverting.

Sorry about that.  Let me know if you want me to look into this.