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Subject: Re: KASAN: null-ptr-deref Write in xdp_umem_unaccount_pages
To:     syzbot <syzbot+979217770b09ebf5c407@syzkaller.appspotmail.com>,
        bjorn.topel@intel.com, davem@davemloft.net,
        linux-kernel@vger.kernel.org, magnus.karlsson@intel.com,
        netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com
References: <00000000000037bf29056e114a86@google.com>
From:   Daniel Borkmann <daniel@iogearbox.net>
Message-ID: <7459a2d0-011b-d439-bef2-cb0b4e574c4b@iogearbox.net>
Date:   Fri, 8 Jun 2018 11:50:17 +0200
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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@syzkaller.appspotmail.com

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