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Date:   Thu, 23 Apr 2020 06:59:03 -0700
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Message-ID: <000000000000c5b43705a3f5a69f@google.com>
Subject: Re: general protection fault in go7007_usb_probe
From:   syzbot <syzbot+cabfa4b5b05ff6be4ef0@syzkaller.appspotmail.com>
To:     andreyknvl@google.com, hverkuil-cisco@xs4all.nl,
        linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
        linux-usb@vger.kernel.org, mchehab@kernel.org, oneukum@suse.com,
        syzkaller-bugs@googlegroups.com
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hello,

syzbot has tested the proposed patch but the reproducer still triggered crash:
general protection fault in go7007_usb_probe

usb 3-1: string descriptor 0 read error: -71
general protection fault, probably for non-canonical address 0xdffffc00000000bd: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000005e8-0x00000000000005ef]
CPU: 1 PID: 21 Comm: kworker/1:1 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:go7007_usb_probe+0x1ff/0x1de4 drivers/media/usb/go7007/go7007-usb.c:1130
Code: 03 80 3c 02 00 0f 85 00 19 00 00 4d 8b ae 98 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bd e8 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 cd 18 00 00 4d 8b ad e8 05 00 00 4d 85 ed 0f 84
RSP: 0018:ffff8881da317190 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8881d5768000 RCX: 1ffffffff126c1fa
RDX: 00000000000000bd RSI: ffffffff845438b9 RDI: 00000000000005e8
RBP: ffff8881cbc94000 R08: 0000000000000001 R09: fffffbfff1268ad6
R10: ffffffff893456af R11: fffffbfff1268ad5 R12: ffffffff867853e0
R13: 0000000000000000 R14: ffff8881cbd02400 R15: ffff8881c7f23000
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056141ffa7578 CR3: 00000001ccc54000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:374
 really_probe+0x290/0xac0 drivers/base/dd.c:527
 driver_probe_device+0x223/0x350 drivers/base/dd.c:701
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:808
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431
 __device_attach+0x21a/0x390 drivers/base/dd.c:874
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0x1367/0x1c20 drivers/base/core.c:2533
 usb_set_configuration+0xed4/0x1850 drivers/usb/core/message.c:2025
 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:241
 usb_probe_device+0xd9/0x230 drivers/usb/core/driver.c:272
 really_probe+0x290/0xac0 drivers/base/dd.c:527
 driver_probe_device+0x223/0x350 drivers/base/dd.c:701
 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:808
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431
 __device_attach+0x21a/0x390 drivers/base/dd.c:874
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0x1367/0x1c20 drivers/base/core.c:2533
 usb_new_device.cold+0x540/0xcd0 drivers/usb/core/hub.c:2548
 hub_port_connect drivers/usb/core/hub.c:5195 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5335 [inline]
 port_event drivers/usb/core/hub.c:5481 [inline]
 hub_event+0x21cb/0x4300 drivers/usb/core/hub.c:5563
 process_one_work+0x965/0x1630 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x326/0x430 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 3c58732c46bcaa36 ]---
RIP: 0010:go7007_usb_probe+0x1ff/0x1de4 drivers/media/usb/go7007/go7007-usb.c:1130
Code: 03 80 3c 02 00 0f 85 00 19 00 00 4d 8b ae 98 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bd e8 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 cd 18 00 00 4d 8b ad e8 05 00 00 4d 85 ed 0f 84
RSP: 0018:ffff8881da317190 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8881d5768000 RCX: 1ffffffff126c1fa
RDX: 00000000000000bd RSI: ffffffff845438b9 RDI: 00000000000005e8
RBP: ffff8881cbc94000 R08: 0000000000000001 R09: fffffbfff1268ad6
R10: ffffffff893456af R11: fffffbfff1268ad5 R12: ffffffff867853e0
R13: 0000000000000000 R14: ffff8881cbd02400 R15: ffff8881c7f23000
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056141ffa7578 CR3: 00000001ccc54000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         e9010320 usb: cdns3: gadget: make a bunch of functions sta..
git tree:       https://github.com/google/kasan.git
console output: https://syzkaller.appspot.com/x/log.txt?x=158aba87e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bd14feb44652cfaf
dashboard link: https://syzkaller.appspot.com/bug?extid=cabfa4b5b05ff6be4ef0
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12d0bfd7e00000