linux-kernel - Re: KASAN: use-after-free Read in nf_ct_deliver_cached

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Message-ID: <20191025061145.GX25052@breakpoint.cc>
Date:   Fri, 25 Oct 2019 08:11:45 +0200
From:   Florian Westphal <fw@...len.de>
To:     syzbot <syzbot+c7aabc9fe93e7f3637ba@...kaller.appspotmail.com>
Cc:     coreteam@...filter.org, davem@...emloft.net, dhowells@...hat.com,
        fw@...len.de, kadlec@...filter.org, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, pablo@...filter.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in nf_ct_deliver_cached_events

syzbot <syzbot+c7aabc9fe93e7f3637ba@...kaller.appspotmail.com> wrote:
> syzbot has bisected this bug to:
> 
> commit 2341e0775747864b684abe8627f3d45b167f2940
> Author: David Howells <dhowells@...hat.com>
> Date:   Thu Jun 9 22:02:51 2016 +0000
> 
>     rxrpc: Simplify connect() implementation and simplify sendmsg() op
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12f869df600000

Looks like 5.2 and earlier crash with a different backtrace than
original.

Proposed patch for this netfilter splat is:
https://patchwork.ozlabs.org/patch/1181533/