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Subjectgeneral protection fault in smsusb_init_device
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Hello,

syzbot found the following crash on:

HEAD commit: d34f9519 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=128ec3fd200000
kernel config: https://syzkaller.appspot.com/x/.config?x=c73d1bb5aeaeae20
dashboard link: https://syzkaller.appspot.com/bug?extid=53f029db71c19a47325a
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16138e67200000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=128dddbf200000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+53f029db71c19a47325a@syzkaller.appspotmail.com

usb 1-1: config 0 descriptor??
usb 1-1: string descriptor 0 read error: -71
smsusb:smsusb_probe: board id=18, interface number 0
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 PTI
CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.1.0-rc5-319617-gd34f951 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:smsusb_init_device+0x366/0x937
drivers/media/usb/siano/smsusb.c:429
Code: 48 c1 ea 03 80 3c 02 00 74 05 e8 24 1e 66 f7 4d 8b b6 f0 04 00 00 b8
ff ff 37 00 48 c1 e0 2a 49 8d 7e 04 48 89 fa 48 c1 ea 03 <8a> 14 02 48 89
f8 83 e0 07 ff c0 38 d0 7c 09 84 d2 74 05 e8 b1 1d
RSP: 0018:ffff8880a86570d0 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: ffff88809a81b300 RCX: ffffffff8a42b5b3
RDX: 0000000000000000 RSI: ffffffff8a42b6a3 RDI: 0000000000000004
RBP: ffff88808ca70000 R08: ffff8880a8503100 R09: ffff8880a8657130
R10: ffffed10150cae34 R11: ffff8880a86571a7 R12: ffff88809a81be54
R13: ffff88809a81be5c R14: 0000000000000000 R15: ffff88808ca70000
FS: 0000000000000000(0000) GS:ffff8880ad100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1ad259d000 CR3: 000000009a3aa000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
smsusb_probe+0xd64/0xe08 drivers/media/usb/siano/smsusb.c:570
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+0x1398/0x3b00 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
Modules linked in:
---[ end trace 6175778b99b10882 ]---
RIP: 0010:smsusb_init_device+0x366/0x937
drivers/media/usb/siano/smsusb.c:429
Code: 48 c1 ea 03 80 3c 02 00 74 05 e8 24 1e 66 f7 4d 8b b6 f0 04 00 00 b8
ff ff 37 00 48 c1 e0 2a 49 8d 7e 04 48 89 fa 48 c1 ea 03 <8a> 14 02 48 89
f8 83 e0 07 ff c0 38 d0 7c 09 84 d2 74 05 e8 b1 1d
RSP: 0018:ffff8880a86570d0 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: ffff88809a81b300 RCX: ffffffff8a42b5b3
RDX: 0000000000000000 RSI: ffffffff8a42b6a3 RDI: 0000000000000004
RBP: ffff88808ca70000 R08: ffff8880a8503100 R09: ffff8880a8657130
R10: ffffed10150cae34 R11: ffff8880a86571a7 R12: ffff88809a81be54
R13: ffff88809a81be5c R14: 0000000000000000 R15: ffff88808ca70000
FS: 0000000000000000(0000) GS:ffff8880ad100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1ad259d000 CR3: 000000009a3aa000 CR4: 00000000001406e0
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@googlegroups.com.

syzbot will keep track of this bug report. See:
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syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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