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Date:   Fri, 12 Apr 2019 07:26:10 -0700
From:   syzbot <syzbot+ead4037ec793e025e66f@...kaller.appspotmail.com>
To:     andreyknvl@...gle.com, davem@...emloft.net, kvalo@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: general protection fault in ath6kl_usb_alloc_urb_from_pipe

Hello,

syzbot found the following crash on:

HEAD commit:    9a33b369 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=12405cd3200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=23e37f59d94ddd15
dashboard link: https://syzkaller.appspot.com/bug?extid=ead4037ec793e025e66f
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11acc1af200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1344acd3200000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ead4037ec793e025e66f@...kaller.appspotmail.com

usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: string descriptor 0 read error: -71
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: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.1.0-rc4-319354-g9a33b36 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:__lock_acquire+0xadc/0x37c0 kernel/locking/lockdep.c:3573
Code: 00 0f 85 c1 1d 00 00 48 81 c4 10 01 00 00 5b 5d 41 5c 41 5d 41 5e 41  
5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f  
85 35 1e 00 00 49 81 7d 00 40 39 01 96 0f 84 e8 f5
RSP: 0018:ffff8880a84b6f78 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: ffff8880a849c980 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8880a849c980 R12: 0000000000000000
R13: 0000000000000018 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880ad000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c6768 CR3: 000000009b83e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  lock_acquire+0x10d/0x2f0 kernel/locking/lockdep.c:4211
  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
  _raw_spin_lock_irqsave+0x44/0x60 kernel/locking/spinlock.c:152
  ath6kl_usb_alloc_urb_from_pipe+0x49/0x2b0  
drivers/net/wireless/ath/ath6kl/usb.c:135
  ath6kl_usb_post_recv_transfers.constprop.0+0x233/0x400  
drivers/net/wireless/ath/ath6kl/usb.c:410
  ath6kl_usb_start_recv_pipes drivers/net/wireless/ath/ath6kl/usb.c:484  
[inline]
  hif_start drivers/net/wireless/ath/ath6kl/usb.c:682 [inline]
  ath6kl_usb_power_on+0x8d/0x120 drivers/net/wireless/ath/ath6kl/usb.c:1041
  ath6kl_hif_power_on drivers/net/wireless/ath/ath6kl/hif-ops.h:136 [inline]
  ath6kl_core_init drivers/net/wireless/ath/ath6kl/core.c:97 [inline]
  ath6kl_core_init+0x1b8/0x1060 drivers/net/wireless/ath/ath6kl/core.c:66
  ath6kl_usb_probe+0xc7f/0x1180 drivers/net/wireless/ath/ath6kl/usb.c:1147
  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+0x138e/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 4efca44223c9b0b0 ]---
RIP: 0010:__lock_acquire+0xadc/0x37c0 kernel/locking/lockdep.c:3573
Code: 00 0f 85 c1 1d 00 00 48 81 c4 10 01 00 00 5b 5d 41 5c 41 5d 41 5e 41  
5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f  
85 35 1e 00 00 49 81 7d 00 40 39 01 96 0f 84 e8 f5
RSP: 0018:ffff8880a84b6f78 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: ffff8880a849c980 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8880a849c980 R12: 0000000000000000
R13: 0000000000000018 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880ad000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c6768 CR3: 000000009b83e000 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@...glegroups.com.

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

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