general protection fault in close_rio

From: syzbot
Date: Thu Sep 19 2019 - 14:19:14 EST

Hello,

syzbot found the following crash on:

HEAD commit: e0bd8d79 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=10c403c9600000
kernel config: https://syzkaller.appspot.com/x/.config?x=8847e5384a16f66a
dashboard link: https://syzkaller.appspot.com/bug?extid=ffb8ab77a232a91eb24d
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+ffb8ab77a232a91eb24d@xxxxxxxxxxxxxxxxxxxxxxxxx

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: 18871 Comm: syz-executor.4 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:dev_name include/linux/device.h:1342 [inline]
RIP: 0010:__dev_printk+0x3a/0x203 drivers/base/core.c:3335
Code: 89 f5 53 e8 6f ab d1 fe 48 85 ed 0f 84 bc 01 00 00 e8 61 ab d1 fe 48 8d 7d 50 b8 ff ff 37 00 48 89 fa 48 c1 e0 2a 48 c1 ea 03 <80> 3c 02 00 74 05 e8 12 62 f8 fe 4c 8b 7d 50 4d 85 ff 75 27 e8 34
RSP: 0018:ffff8881d5fe7cf8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffed103abfcfa6 RCX: ffffffff8388846d
RDX: 000000000000001e RSI: ffffffff826c929f RDI: 00000000000000f0
RBP: 00000000000000a0 R08: ffff8881b2c7b000 R09: fffffbfff0e586ed
R10: ffff8881d5fe7e28 R11: ffffffff872c3767 R12: ffffffff85f2b0e0
R13: ffff8881d5fe7d50 R14: ffff8881ca3eaa08 R15: ffffffff83888440
FS: 0000555556264940(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e82d000 CR3: 00000001caefb000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
_dev_info+0xd7/0x109 drivers/base/core.c:3381
close_rio.cold+0x1f/0x24 drivers/usb/misc/rio500.c:96
__fput+0x2d7/0x840 fs/file_table.c:280
task_work_run+0x13f/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x1d2/0x200 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
do_syscall_64+0x45f/0x580 arch/x86/entry/common.c:300
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4135d1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffe720c0770 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00000000004135d1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000001 R08: ffffffff81160fc4 R09: 000000004679f032
R10: 00007ffe720c0850 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 0000000000760ec0 R15: 000000000075bfd4
Modules linked in:
---[ end trace a70ef99560251cf4 ]---
RIP: 0010:dev_name include/linux/device.h:1342 [inline]
RIP: 0010:__dev_printk+0x3a/0x203 drivers/base/core.c:3335
Code: 89 f5 53 e8 6f ab d1 fe 48 85 ed 0f 84 bc 01 00 00 e8 61 ab d1 fe 48 8d 7d 50 b8 ff ff 37 00 48 89 fa 48 c1 e0 2a 48 c1 ea 03 <80> 3c 02 00 74 05 e8 12 62 f8 fe 4c 8b 7d 50 4d 85 ff 75 27 e8 34
RSP: 0018:ffff8881d5fe7cf8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffed103abfcfa6 RCX: ffffffff8388846d
RDX: 000000000000001e RSI: ffffffff826c929f RDI: 00000000000000f0
RBP: 00000000000000a0 R08: ffff8881b2c7b000 R09: fffffbfff0e586ed
R10: ffff8881d5fe7e28 R11: ffffffff872c3767 R12: ffffffff85f2b0e0
R13: ffff8881d5fe7d50 R14: ffff8881ca3eaa08 R15: ffffffff83888440
FS: 0000555556264940(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e82d000 CR3: 00000001caefb000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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@xxxxxxxxxxxxxxxxx

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.