From: Eric Dumazet <eric.dumazet@gmail.com>
To: Cong Wang <xiyou.wangcong@gmail.com>,
syzbot <syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com>
Cc: David Miller <davem@davemloft.net>,
Jamal Hadi Salim <jhs@mojatatu.com>,
Jiri Pirko <jiri@resnulli.us>, Jakub Kicinski <kuba@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux Kernel Network Developers <netdev@vger.kernel.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: KASAN: invalid-free in tcf_exts_destroy
Date: Tue, 10 Mar 2020 13:36:02 -0700 [thread overview]
Message-ID: <635ab023-d180-7ddf-a280-78080040512c@gmail.com> (raw)
In-Reply-To: <CAM_iQpVgQ+Mc16CVds-ywp6YHEbwbGtJwqoQXBFbrMTOUZS0YQ@mail.gmail.com>
On 3/10/20 11:33 AM, Cong Wang wrote:
> On Sun, Mar 8, 2020 at 12:35 PM syzbot
> <syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit: c2003765 Merge tag 'io_uring-5.6-2020-03-07' of git://git...
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=10cd2ae3e00000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=4527d1e2fb19fd5c
>> dashboard link: https://syzkaller.appspot.com/bug?extid=dcc34d54d68ef7d2d53d
>> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>> userspace arch: i386
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1561b01de00000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15aad2f9e00000
>>
>> The bug was bisected to:
>>
>> commit 599be01ee567b61f4471ee8078870847d0a11e8e
>> Author: Cong Wang <xiyou.wangcong@gmail.com>
>> Date: Mon Feb 3 05:14:35 2020 +0000
>>
>> net_sched: fix an OOB access in cls_tcindex
>>
>> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10a275fde00000
>> final crash: https://syzkaller.appspot.com/x/report.txt?x=12a275fde00000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=14a275fde00000
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com
>> Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")
>>
>> IPVS: ftp: loaded support on port[0] = 21
>> ==================================================================
>> BUG: KASAN: double-free or invalid-free in tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
>>
>> CPU: 1 PID: 9507 Comm: syz-executor467 Not tainted 5.6.0-rc4-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
>> Call Trace:
>> __dump_stack lib/dump_stack.c:77 [inline]
>> dump_stack+0x188/0x20d lib/dump_stack.c:118
>> print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374
>> kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:468
>> __kasan_slab_free+0x129/0x140 mm/kasan/common.c:455
>> __cache_free mm/slab.c:3426 [inline]
>> kfree+0x109/0x2b0 mm/slab.c:3757
>> tcf_exts_destroy+0x62/0xc0 net/sched/cls_api.c:3002
>> tcf_exts_change+0xf4/0x150 net/sched/cls_api.c:3059
>> tcindex_set_parms+0xed8/0x1a00 net/sched/cls_tcindex.c:456
>
> Looks like a consequence of "slab-out-of-bounds Write in tcindex_set_parms".
>
> Thanks.
>
I have a dozen more syzbot reports involving net/sched code, do you want
me to release them right now ?
next prev parent reply other threads:[~2020-03-10 20:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-08 19:35 KASAN: invalid-free in tcf_exts_destroy syzbot
2020-03-10 18:33 ` Cong Wang
2020-03-10 20:36 ` Eric Dumazet [this message]
2020-03-10 22:02 ` Cong Wang
2020-03-11 1:17 ` Cong Wang
2020-03-11 5:14 ` syzbot
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