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Date:   Wed, 24 Jul 2019 22:04:05 -0700
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Subject: Re: general protection fault in __pm_runtime_resume
From:   syzbot <syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com>
To:     andreyknvl@google.com, gregkh@linuxfoundation.org,
        len.brown@intel.com, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, pavel@ucw.cz,
        rjw@rjwysocki.net, syzkaller-bugs@googlegroups.com
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Sender: linux-kernel-owner@vger.kernel.org
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syzbot has found a reproducer for the following crash on:

HEAD commit:    6a3599ce 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=108edb68600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
dashboard link: https://syzkaller.appspot.com/bug?extid=3cbe5cd105d2ad56a1df
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13f0b4c8600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=172d8758600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 0 PID: 1740 Comm: syz-executor618 Not tainted 5.2.0-rc6+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02  
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48  
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
RSP: 0018:ffff8881cf5878e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff82676833
RDX: 000000021d463be5 RSI: ffffffff82676841 RDI: 00000010ea31df2b
RBP: 00000010ea31dc6a R08: ffff8881d1b7e000 R09: fffffbfff0e84c25
R10: ffff8881cf587940 R11: ffffffff87426127 R12: 0000000000000004
R13: 0000000000000000 R14: ffff8881cfd7a500 R15: ffffffff897f9040
FS:  0000555555808880(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000043f760 CR3: 00000001d0f29000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  pm_runtime_get_sync include/linux/pm_runtime.h:226 [inline]
  usb_autopm_get_interface+0x1b/0x50 drivers/usb/core/driver.c:1707
  usbhid_power+0x7c/0xe0 drivers/hid/usbhid/hid-core.c:1234
  hid_hw_power include/linux/hid.h:1038 [inline]
  hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
  chrdev_open+0x219/0x5c0 fs/char_dev.c:413
  do_dentry_open+0x497/0x1040 fs/open.c:778
  do_last fs/namei.c:3416 [inline]
  path_openat+0x1430/0x3ff0 fs/namei.c:3533
  do_filp_open+0x1a1/0x280 fs/namei.c:3563
  do_sys_open+0x3c0/0x580 fs/open.c:1070
  do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x401ad0
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 fd 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:00007ffed8d15738 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000401ad0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffed8d15740
RBP: 6666666666666667 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402af0
R13: 0000000000402b80 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 60987a9feed42828 ]---
RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02  
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48  
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
RSP: 0018:ffff8881cf5878e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff82676833
RDX: 000000021d463be5 RSI: ffffffff82676841 RDI: 00000010ea31df2b
RBP: 00000010ea31dc6a R08: ffff8881d1b7e000 R09: fffffbfff0e84c25
R10: ffff8881cf587940 R11: ffffffff87426127 R12: 0000000000000004
R13: 0000000000000000 R14: ffff8881cfd7a500 R15: ffffffff897f9040
FS:  0000555555808880(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000043f760 CR3: 00000001d0f29000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400