On Thu, Jul 25, 2019 at 7:04 AM syzbot
<syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com> wrote:
>
> 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
>

Let's try Hillf's patch here as well:

#syz test: https://github.com/google/kasan.git 6a3599ce