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

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Message-ID: <20190819154232.4f1ed902@cakuba.netronome.com>
Date:   Mon, 19 Aug 2019 15:42:32 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     syzbot <syzbot+66fbe4719f6ef22754ee@...kaller.appspotmail.com>
Cc:     aviadye@...lanox.com, borisp@...lanox.com, daniel@...earbox.net,
        davejwatson@...com, davem@...emloft.net, john.fastabend@...il.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in tls_push_sg

On Fri, 17 May 2019 11:40:05 -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    35c99ffa Merge tag 'for_linus' of git://git.kernel.org/pub..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=10ff3322a00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=82f0809e8f0a8c87
> dashboard link: https://syzkaller.appspot.com/bug?extid=66fbe4719f6ef22754ee
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> 
> Unfortunately, I don't have any reproducer for this crash yet.
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+66fbe4719f6ef22754ee@...kaller.appspotmail.com

Most likely:

#syz fix: net/tls: fix page double free on TX cleanup