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Date:   Mon, 16 Sep 2019 11:49:10 -0700
Message-ID: <00000000000031432d0592b00f44@google.com>
Subject: KMSAN: uninit-value in usb_autopm_put_interface
From:   syzbot <syzbot+e1d1a6e595adbd2458f1@syzkaller.appspotmail.com>
To:     glider@google.com, gregkh@linuxfoundation.org,
        kai.heng.feng@canonical.com, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org, stern@rowland.harvard.edu,
        syzkaller-bugs@googlegroups.com, yuehaibing@huawei.com
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Sender: linux-kernel-owner@vger.kernel.org
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Hello,

syzbot found the following crash on:

HEAD commit:    014077b5 DO-NOT-SUBMIT: usb-fuzzer: main usb gadget fuzzer..
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=16a7dde1600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f03c659d0830ab8d
dashboard link: https://syzkaller.appspot.com/bug?extid=e1d1a6e595adbd2458f1
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=176303e1600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10e8f23e600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e1d1a6e595adbd2458f1@syzkaller.appspotmail.com

==================================================================
BUG: KMSAN: uninit-value in __write_once_size include/linux/compiler.h:235  
[inline]
BUG: KMSAN: uninit-value in pm_runtime_mark_last_busy  
include/linux/pm_runtime.h:107 [inline]
BUG: KMSAN: uninit-value in usb_mark_last_busy include/linux/usb.h:774  
[inline]
BUG: KMSAN: uninit-value in usb_autopm_put_interface+0xf2/0x120  
drivers/usb/core/driver.c:1630
CPU: 0 PID: 11318 Comm: syz-executor549 Not tainted 5.3.0-rc7+ #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+0x191/0x1f0 lib/dump_stack.c:113
  kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109
  __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294
  __write_once_size include/linux/compiler.h:235 [inline]
  pm_runtime_mark_last_busy include/linux/pm_runtime.h:107 [inline]
  usb_mark_last_busy include/linux/usb.h:774 [inline]
  usb_autopm_put_interface+0xf2/0x120 drivers/usb/core/driver.c:1630
  usbhid_power+0x12a/0x170 drivers/hid/usbhid/hid-core.c:1238
  hid_hw_power include/linux/hid.h:1038 [inline]
  drop_ref drivers/hid/hidraw.c:338 [inline]
  hidraw_release+0x4a9/0x6b0 drivers/hid/hidraw.c:356
  __fput+0x4c9/0xba0 fs/file_table.c:280
  ____fput+0x37/0x40 fs/file_table.c:313
  task_work_run+0x22e/0x2a0 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:188 [inline]
  exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
  prepare_exit_to_usermode+0x39d/0x4d0 arch/x86/entry/common.c:194
  syscall_return_slowpath+0x90/0x610 arch/x86/entry/common.c:274
  do_syscall_64+0xe2/0xf0 arch/x86/entry/common.c:300
  entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x401b20
Code: 01 f0 ff ff 0f 83 c0 0b 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f  
44 00 00 83 3d ad 5b 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00
RSP: 002b:00007ffc46217cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffea RBX: 0000000000000000 RCX: 0000000000401b20
RDX: 0000000000000000 RSI: 000000000010503d RDI: 00007ffc46217cc0
RBP: 6666666666666667 R08: 000000000000000f R09: 000000000000000b
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000402b40
R13: 0000000000402bd0 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
  kmsan_save_stack_with_flags mm/kmsan/kmsan.c:189 [inline]
  kmsan_internal_poison_shadow+0x58/0xb0 mm/kmsan/kmsan.c:148
  kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:195
  slab_free_freelist_hook mm/slub.c:1472 [inline]
  slab_free mm/slub.c:3038 [inline]
  kfree+0x4c1/0x2db0 mm/slub.c:3980
  usb_release_interface+0x105/0x120 drivers/usb/core/message.c:1633
  device_release+0xe2/0x380 drivers/base/core.c:1060
  kobject_cleanup lib/kobject.c:693 [inline]
  kobject_release lib/kobject.c:722 [inline]
  kref_put include/linux/kref.h:65 [inline]
  kobject_put+0x38d/0x480 lib/kobject.c:739
  put_device+0x51/0x70 drivers/base/core.c:2264
  usb_disable_device+0x69a/0x1150 drivers/usb/core/message.c:1248
  usb_disconnect+0x51e/0xd60 drivers/usb/core/hub.c:2199
  hub_port_connect drivers/usb/core/hub.c:4949 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
  port_event drivers/usb/core/hub.c:5359 [inline]
  hub_event+0x3fd0/0x72f0 drivers/usb/core/hub.c:5441
  process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269
  worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
  kthread+0x4b5/0x4f0 kernel/kthread.c:256
  ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
==================================================================


---
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