linux-kernel - Re: NULL pointer dereference in nft_set_elem

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Message-ID: <20190309003534.4f114b38@fire.localdomain>
Date:   Sat, 9 Mar 2019 00:35:34 +0300
From:   Dmitrii Tcvetkov <demfloro@...floro.ru>
To:     Florian Westphal <fw@...len.de>
Cc:     netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: NULL pointer dereference in nft_set_elem_destroy()

On Fri, 8 Mar 2019 11:50:39 +0100
Florian Westphal <fw@...len.de> wrote:

> Dmitrii Tcvetkov <demfloro@...floro.ru> wrote:
> > After upgrade to 5.0 on XPS 13 9360 I get NULL pointer dereference
> > in dmesg (attached). Distro is Arch Linux, kernel is built with
> > custom config (attached), but distro kernel[1] reproduces the issue
> > on the laptop as well.
> > 
> > Bisect led me to commit f6ac858589768 (netfilter: nf_tables: unbind
> > set in rule from commit path), bisect log attached. The commit
> > doesn't revert cleanly on top of v5.0, and conflicts aren't trivial
> > for me to resolve.
> 
> Please see
> https://patchwork.ozlabs.org/patch/1053232/
> 
> this probably resolves this crash as well.

Thank you! With the patch nft loads ruleset fine.