linux-kernel - Re: KASAN: null-ptr-deref Write in xdp_umem_unaccount

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Message-ID: <7459a2d0-011b-d439-bef2-cb0b4e574c4b@iogearbox.net>
Date:   Fri, 8 Jun 2018 11:50:17 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     syzbot <syzbot+979217770b09ebf5c407@...kaller.appspotmail.com>,
        bjorn.topel@...el.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org, magnus.karlsson@...el.com,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: null-ptr-deref Write in xdp_umem_unaccount_pages

On 06/07/2018 08:17 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    1c8c5a9d38f6 Merge git://git.kernel.org/pub/scm/linux/kern..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13a72bdf800000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4f1acdf888c9d4e9
> dashboard link: https://syzkaller.appspot.com/bug?extid=979217770b09ebf5c407
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=12aca2af800000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161d4ddf800000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+979217770b09ebf5c407@...kaller.appspotmail.com

#syz fix: bpf, xdp: fix crash in xdp_umem_unaccount_pages