Date:   Fri, 17 Jan 2020 01:57:10 -0800
From:   syzbot <syzbot+afeecc39f502a8681560@...kaller.appspotmail.com>
To:     arnd@...db.de, dhowells@...hat.com, dmitry.torokhov@...il.com,
        ebiederm@...ssion.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        stern@...land.harvard.edu, syzkaller-bugs@...glegroups.com
Subject: linux-next boot error: KASAN: slab-out-of-bounds Read in post_usb_notification

Hello,

syzbot found the following crash on:

HEAD commit:    de970dff Add linux-next specific files for 20200117
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=163472d1e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c59155180d08b1f7
dashboard link: https://syzkaller.appspot.com/bug?extid=afeecc39f502a8681560
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+afeecc39f502a8681560@...kaller.appspotmail.com

usbcore: registered new interface driver usb-storage
usbcore: registered new interface driver ums-realtek
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial support registered for generic
usbcore: registered new interface driver ch341
usbserial: USB Serial support registered for ch341-uart
usbcore: registered new interface driver cp210x
usbserial: USB Serial support registered for cp210x
usbcore: registered new interface driver ftdi_sio
usbserial: USB Serial support registered for FTDI USB Serial Device
usbcore: registered new interface driver keyspan
usbserial: USB Serial support registered for Keyspan - (without firmware)
usbserial: USB Serial support registered for Keyspan 1 port adapter
usbserial: USB Serial support registered for Keyspan 2 port adapter
usbserial: USB Serial support registered for Keyspan 4 port adapter
usbcore: registered new interface driver option
usbserial: USB Serial support registered for GSM modem (1-port)
usbcore: registered new interface driver oti6858
usbserial: USB Serial support registered for oti6858
usbcore: registered new interface driver pl2303
usbserial: USB Serial support registered for pl2303
usbcore: registered new interface driver qcserial
usbserial: USB Serial support registered for Qualcomm USB modem
usbcore: registered new interface driver sierra
usbserial: USB Serial support registered for Sierra USB modem
usbcore: registered new interface driver usb_serial_simple
usbserial: USB Serial support registered for carelink
usbserial: USB Serial support registered for zio
usbserial: USB Serial support registered for funsoft
usbserial: USB Serial support registered for flashloader
usbserial: USB Serial support registered for google
usbserial: USB Serial support registered for libtransistor
usbserial: USB Serial support registered for vivopay
usbserial: USB Serial support registered for moto_modem
usbserial: USB Serial support registered for motorola_tetra
usbserial: USB Serial support registered for novatel_gps
usbserial: USB Serial support registered for hp4x
usbserial: USB Serial support registered for suunto
usbserial: USB Serial support registered for siemens_mpi
dummy_hcd dummy_hcd.0: USB Host+Gadget Emulator, driver 02 May 2005
dummy_hcd dummy_hcd.0: Dummy host controller
dummy_hcd dummy_hcd.0: new USB bus registered, assigned bus number 1
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice=  
5.05
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: Dummy host controller
usb usb1: Manufacturer: Linux 5.5.0-rc6-next-20200117-syzkaller dummy_hcd
usb usb1: SerialNumber: dummy_hcd.0
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:426 [inline]
BUG: KASAN: slab-out-of-bounds in post_usb_notification+0xe5/0x170  
drivers/usb/core/devio.c:2771
Read of size 21 at addr ffff88809ef1d5c0 by task swapper/0/1

CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc6-next-20200117-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+0x197/0x210 lib/dump_stack.c:118
  print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
  __kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506
  kasan_report+0x12/0x20 mm/kasan/common.c:641
  check_memory_region_inline mm/kasan/generic.c:185 [inline]
  check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
  memcpy+0x24/0x50 mm/kasan/common.c:127
  memcpy include/linux/string.h:426 [inline]
  post_usb_notification+0xe5/0x170 drivers/usb/core/devio.c:2771
  post_usb_device_notification drivers/usb/core/devio.c:2785 [inline]
  usbdev_notify+0x2c0/0x4a0 drivers/usb/core/devio.c:2800
  notifier_call_chain+0xc2/0x230 kernel/notifier.c:83
  __blocking_notifier_call_chain kernel/notifier.c:284 [inline]
  __blocking_notifier_call_chain kernel/notifier.c:271 [inline]
  blocking_notifier_call_chain kernel/notifier.c:295 [inline]
  blocking_notifier_call_chain+0x94/0xb0 kernel/notifier.c:292
  usb_notify_add_device+0x22/0x30 drivers/usb/core/notify.c:51
  generic_probe+0x8c/0xde drivers/usb/core/generic.c:220
  usb_probe_device+0xa0/0xf0 drivers/usb/core/driver.c:266
  really_probe+0x291/0x700 drivers/base/dd.c:551
  driver_probe_device+0x110/0x220 drivers/base/dd.c:724
  __device_attach_driver+0x1c9/0x230 drivers/base/dd.c:831
  bus_for_each_drv+0x172/0x1f0 drivers/base/bus.c:431
  __device_attach+0x237/0x390 drivers/base/dd.c:897
  device_initial_probe+0x1b/0x20 drivers/base/dd.c:944
  bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:491
  device_add+0x14fe/0x1d00 drivers/base/core.c:2487
  usb_new_device.cold+0x74c/0x1063 drivers/usb/core/hub.c:2539
  register_root_hub drivers/usb/core/hcd.c:1008 [inline]
  usb_add_hcd.cold+0x10f8/0x1496 drivers/usb/core/hcd.c:2790
  dummy_hcd_probe+0x1ae/0x32c drivers/usb/gadget/udc/dummy_hcd.c:2639
  platform_drv_probe+0x8d/0x140 drivers/base/platform.c:727
  really_probe+0x291/0x700 drivers/base/dd.c:551
  driver_probe_device+0x110/0x220 drivers/base/dd.c:724
  __device_attach_driver+0x1c9/0x230 drivers/base/dd.c:831
  bus_for_each_drv+0x172/0x1f0 drivers/base/bus.c:431
  __device_attach+0x237/0x390 drivers/base/dd.c:897
  device_initial_probe+0x1b/0x20 drivers/base/dd.c:944
  bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:491
  device_add+0x14fe/0x1d00 drivers/base/core.c:2487
  platform_device_add+0x365/0x6e0 drivers/base/platform.c:564
  init+0x534/0xab8 arch/x86/crypto/chacha_glue.c:293
  do_one_initcall+0x120/0x820 init/main.c:1109
  do_initcall_level init/main.c:1182 [inline]
  do_initcalls init/main.c:1198 [inline]
  do_basic_setup init/main.c:1218 [inline]
  kernel_init_freeable+0x522/0x5d0 init/main.c:1402
  kernel_init+0x12/0x1bf init/main.c:1309
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 1:
  save_stack+0x23/0x90 mm/kasan/common.c:72
  set_track mm/kasan/common.c:80 [inline]
  __kasan_kmalloc mm/kasan/common.c:515 [inline]
  __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:488
  kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529
  __do_kmalloc mm/slab.c:3656 [inline]
  __kmalloc_track_caller+0x15f/0x760 mm/slab.c:3671
  kvasprintf+0xc8/0x170 lib/kasprintf.c:25
  kvasprintf_const+0x65/0x190 lib/kasprintf.c:49
  kobject_set_name_vargs+0x5b/0x150 lib/kobject.c:289
  dev_set_name+0xbb/0xf0 drivers/base/core.c:2265
  usb_alloc_dev+0xcc4/0xf86 drivers/usb/core/usb.c:641
  usb_add_hcd.cold+0x3c1/0x1496 drivers/usb/core/hcd.c:2697
  dummy_hcd_probe+0x1ae/0x32c drivers/usb/gadget/udc/dummy_hcd.c:2639
  platform_drv_probe+0x8d/0x140 drivers/base/platform.c:727
  really_probe+0x291/0x700 drivers/base/dd.c:551
  driver_probe_device+0x110/0x220 drivers/base/dd.c:724
  __device_attach_driver+0x1c9/0x230 drivers/base/dd.c:831
  bus_for_each_drv+0x172/0x1f0 drivers/base/bus.c:431
  __device_attach+0x237/0x390 drivers/base/dd.c:897
  device_initial_probe+0x1b/0x20 drivers/base/dd.c:944
  bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:491
  device_add+0x14fe/0x1d00 drivers/base/core.c:2487
  platform_device_add+0x365/0x6e0 drivers/base/platform.c:564
  init+0x534/0xab8 arch/x86/crypto/chacha_glue.c:293
  do_one_initcall+0x120/0x820 init/main.c:1109
  do_initcall_level init/main.c:1182 [inline]
  do_initcalls init/main.c:1198 [inline]
  do_basic_setup init/main.c:1218 [inline]
  kernel_init_freeable+0x522/0x5d0 init/main.c:1402
  kernel_init+0x12/0x1bf init/main.c:1309
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88809ef1d5c0
  which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
  32-byte region [ffff88809ef1d5c0, ffff88809ef1d5e0)
The buggy address belongs to the page:
page:ffffea00027bc740 refcount:1 mapcount:0 mapping:ffff8880aa4001c0  
index:0xffff88809ef1dfc1
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00027bf048 ffffea00027bf788 ffff8880aa4001c0
raw: ffff88809ef1dfc1 ffff88809ef1d000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff88809ef1d480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
  ffff88809ef1d500: 00 00 00 01 fc fc fc fc fb fb fb fb fc fc fc fc
> ffff88809ef1d580: fb fb fb fb fc fc fc fc 05 fc fc fc fc fc fc fc
                                            ^
  ffff88809ef1d600: 00 fc fc fc fc fc fc fc 00 04 fc fc fc fc fc fc
  ffff88809ef1d680: fb fb fb fb fc fc fc fc 00 04 fc fc fc fc fc fc
==================================================================


---
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@...glegroups.com.

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