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In-Reply-To: <000000000000717347058d56dcc2@google.com>
From:   Andrey Konovalov <andreyknvl@google.com>
Date:   Wed, 17 Jul 2019 13:50:52 +0200
Message-ID: <CAAeHK+zPDgvDr_Bao9dz_7hGEg+Ud6-tj7pZaihKeYHJ8M386Q@mail.gmail.com>
Subject: Re: KASAN: global-out-of-bounds Read in dvb_pll_attach
To:     syzbot <syzbot+8a8f48672560c8ca59dd@syzkaller.appspotmail.com>,
        bnvandana@gmail.com
Cc:     allison@lohutok.net, hverkuil-cisco@xs4all.nl,
        LKML <linux-kernel@vger.kernel.org>, linux-media@vger.kernel.org,
        USB list <linux-usb@vger.kernel.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        rfontana@redhat.com,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
        Thomas Gleixner <tglx@linutronix.de>, tskd08@gmail.com
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Sender: linux-kernel-owner@vger.kernel.org
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--00000000000094a173058ddf1b3a
Content-Type: text/plain; charset="UTF-8"

On Wed, Jul 10, 2019 at 7:18 PM syzbot
<syzbot+8a8f48672560c8ca59dd@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    7829a896 usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=150f8c47a00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f6d4561982f71f63
> dashboard link: https://syzkaller.appspot.com/bug?extid=8a8f48672560c8ca59dd
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16384e27a00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16056038600000

You need to keep the bot in the recipients and also USB bugs can only
be tested on the usb-fuzzer tree.

#syz test: https://github.com/google/kasan.git usb-fuzzer

>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+8a8f48672560c8ca59dd@syzkaller.appspotmail.com
>
> usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the
> software demuxer
> dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
> usb 1-1: media controller created
> dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
> tc90522 0-0018: Toshiba TC90522 attached.
> usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T
> module)...
> dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T
> module' registered.
> ==================================================================
> BUG: KASAN: global-out-of-bounds in dvb_pll_attach+0x6c5/0x830
> drivers/media/dvb-frontends/dvb-pll.c:798
> Read of size 4 at addr ffffffff89c9e5e0 by task kworker/0:1/12
>
> CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.2.0-rc6+ #13
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: usb_hub_wq hub_event
> Call Trace:
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0xca/0x13e lib/dump_stack.c:113
>   print_address_description+0x67/0x231 mm/kasan/report.c:188
>   __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317
>   kasan_report+0xe/0x20 mm/kasan/common.c:614
>   dvb_pll_attach+0x6c5/0x830 drivers/media/dvb-frontends/dvb-pll.c:798
>   dvb_pll_probe+0xfe/0x174 drivers/media/dvb-frontends/dvb-pll.c:877
>   i2c_device_probe+0x790/0xaa0 drivers/i2c/i2c-core-base.c:389
>   really_probe+0x281/0x660 drivers/base/dd.c:509
>   driver_probe_device+0x104/0x210 drivers/base/dd.c:670
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
>   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:843
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2111
>   i2c_new_client_device+0x5b3/0xc40 drivers/i2c/i2c-core-base.c:778
>   i2c_new_device+0x19/0x50 drivers/i2c/i2c-core-base.c:821
>   dvb_module_probe+0xf9/0x220 drivers/media/dvb-core/dvbdev.c:985
>   friio_tuner_attach+0x125/0x1d0 drivers/media/usb/dvb-usb-v2/gl861.c:536
>   dvb_usbv2_adapter_frontend_init
> drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:675 [inline]
>   dvb_usbv2_adapter_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:804
> [inline]
>   dvb_usbv2_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:865 [inline]
>   dvb_usbv2_probe.cold+0x24dc/0x255d
> drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:980
>   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
>   really_probe+0x281/0x660 drivers/base/dd.c:509
>   driver_probe_device+0x104/0x210 drivers/base/dd.c:670
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
>   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:843
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2111
>   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
>   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
>   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
>   really_probe+0x281/0x660 drivers/base/dd.c:509
>   driver_probe_device+0x104/0x210 drivers/base/dd.c:670
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777
>   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:843
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2111
>   usb_new_device.cold+0x8c1/0x1016 drivers/usb/core/hub.c:2534
>   hub_port_connect drivers/usb/core/hub.c:5089 [inline]
>   hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
>   port_event drivers/usb/core/hub.c:5350 [inline]
>   hub_event+0x1ada/0x3590 drivers/usb/core/hub.c:5432
>   process_one_work+0x905/0x1570 kernel/workqueue.c:2269
>   process_scheduled_works kernel/workqueue.c:2331 [inline]
>   worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
>   kthread+0x30b/0x410 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> The buggy address belongs to the variable:
>   id+0x100/0x120
>
> Memory state around the buggy address:
>   ffffffff89c9e480: fa fa fa fa 00 00 fa fa fa fa fa fa 00 00 00 00
>   ffffffff89c9e500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > ffffffff89c9e580: 00 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa
>                                                         ^
>   ffffffff89c9e600: 04 fa fa fa fa fa fa fa 04 fa fa fa fa fa fa fa
>   ffffffff89c9e680: 04 fa fa fa fa fa fa fa 04 fa fa fa fa fa fa fa
> ==================================================================
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches

--00000000000094a173058ddf1b3a
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