Message-ID: <00000000000086f7f20586929239@google.com>
Date:   Mon, 15 Apr 2019 07:36:05 -0700
From:   syzbot <syzbot+a4387f5b6b799f6becbf@...kaller.appspotmail.com>
To:     andreyknvl@...gle.com, brian.warner@...sung.com,
        ezequiel@...labora.com, hans.verkuil@...co.com,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-usb@...r.kernel.org, mchehab@...nel.org,
        niklas.soderlund+renesas@...natech.se,
        sakari.ailus@...ux.intel.com, sque@...omium.org,
        syzkaller-bugs@...glegroups.com
Subject: KASAN: use-after-free Read in v4l2_release

Hello,

syzbot found the following crash on:

HEAD commit:    9a33b369 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan/tree/usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=14ab47ed200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
dashboard link: https://syzkaller.appspot.com/bug?extid=a4387f5b6b799f6becbf
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+a4387f5b6b799f6becbf@...kaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in v4l2_release+0x322/0x390  
drivers/media/v4l2-core/v4l2-dev.c:453
Read of size 8 at addr ffff88809ccf23e0 by task v4l_id/8258

CPU: 1 PID: 8258 Comm: v4l_id Not tainted 5.1.0-rc4-319354-g9a33b36 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
usb-fuzzer-gadget dummy_udc.0: failed to start USB fuzzer: -22
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0xe8/0x16e lib/dump_stack.c:113
  print_address_description+0x6c/0x236 mm/kasan/report.c:187
  kasan_report.cold+0x1a/0x3c mm/kasan/report.c:317
  v4l2_release+0x322/0x390 drivers/media/v4l2-core/v4l2-dev.c:453
  __fput+0x2df/0x8c0 fs/file_table.c:278
  task_work_run+0x149/0x1c0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop+0x243/0x270 arch/x86/entry/common.c:166
  prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
  syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
  do_syscall_64+0x40c/0x4f0 arch/x86/entry/common.c:293
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fd2e34df2b0
Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0  
07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff  
ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24
RSP: 002b:00007ffcfd4e8d68 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fd2e34df2b0
RDX: 00007fd2e3795df0 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fd2e3795df0 R09: 000000000000000a
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884
R13: 00007ffcfd4e8ec0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 5665:
  set_track mm/kasan/common.c:87 [inline]
  __kasan_kmalloc mm/kasan/common.c:497 [inline]
  __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:470
  slab_post_alloc_hook mm/slab.h:437 [inline]
  slab_alloc_node mm/slub.c:2756 [inline]
  __kmalloc_node_track_caller+0xf3/0x320 mm/slub.c:4372
  alloc_dr drivers/base/devres.c:103 [inline]
  devm_kmalloc+0x8c/0x190 drivers/base/devres.c:793
  devm_kzalloc include/linux/device.h:679 [inline]
  usb_raremono_probe+0x34/0x235 drivers/media/radio/radio-raremono.c:298
  usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361
  really_probe+0x2da/0xb10 drivers/base/dd.c:509
  driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
  __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
  bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
  __device_attach+0x223/0x3a0 drivers/base/dd.c:844
  bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
  device_add+0xad2/0x16e0 drivers/base/core.c:2106
  usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021
  generic_probe+0xa2/0xda drivers/usb/core/generic.c:210
  usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266
  really_probe+0x2da/0xb10 drivers/base/dd.c:509
  driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
  __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
  bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
  __device_attach+0x223/0x3a0 drivers/base/dd.c:844
  bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
  device_add+0xad2/0x16e0 drivers/base/core.c:2106
  usb_new_device.cold+0x537/0xccf 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+0x138e/0x3b00 drivers/usb/core/hub.c:5432
  process_one_work+0x90f/0x1580 kernel/workqueue.c:2269
  worker_thread+0x9b/0xe20 kernel/workqueue.c:2415
  kthread+0x313/0x420 kernel/kthread.c:253
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Freed by task 5665:
  set_track mm/kasan/common.c:87 [inline]
  __kasan_slab_free+0x130/0x180 mm/kasan/common.c:459
  slab_free_hook mm/slub.c:1429 [inline]
  slab_free_freelist_hook+0x5e/0x140 mm/slub.c:1456
  slab_free mm/slub.c:3003 [inline]
  kfree+0xce/0x290 mm/slub.c:3958
  release_nodes+0x4ac/0x920 drivers/base/devres.c:508
  devres_release_all+0x79/0xc8 drivers/base/devres.c:529
  __device_release_driver drivers/base/dd.c:1086 [inline]
  device_release_driver_internal+0x23a/0x4f0 drivers/base/dd.c:1113
  bus_remove_device+0x302/0x5c0 drivers/base/bus.c:556
  device_del+0x467/0xb90 drivers/base/core.c:2269
  usb_disable_device+0x242/0x790 drivers/usb/core/message.c:1235
  usb_disconnect+0x298/0x870 drivers/usb/core/hub.c:2197
  hub_port_connect drivers/usb/core/hub.c:4940 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
  port_event drivers/usb/core/hub.c:5350 [inline]
  hub_event+0xcd2/0x3b00 drivers/usb/core/hub.c:5432
  process_one_work+0x90f/0x1580 kernel/workqueue.c:2269
  process_scheduled_works kernel/workqueue.c:2331 [inline]
  worker_thread+0x7b0/0xe20 kernel/workqueue.c:2417
  kthread+0x313/0x420 kernel/kthread.c:253
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff88809ccf2200
  which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 480 bytes inside of
  4096-byte region [ffff88809ccf2200, ffff88809ccf3200)
The buggy address belongs to the page:
page:ffffea0002733c00 count:1 mapcount:0 mapping:ffff88812c3f4600 index:0x0  
compound_mapcount: 0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000200 ffff88812c3f4600
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff88809ccf2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff88809ccf2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88809ccf2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                        ^
  ffff88809ccf2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff88809ccf2480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This bug is generated by a bot. It may contain errors.
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