Date:   Mon, 16 Sep 2019 11:49:09 -0700
From:   syzbot <syzbot+38e7237add3712479d65@...kaller.appspotmail.com>
To:     andreyknvl@...gle.com, benjamin.tissoires@...hat.com,
        jikos@...nel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: WARNING in implement

Hello,

syzbot found the following crash on:

HEAD commit:    f0df5c1b 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=170b213e600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5
dashboard link: https://syzkaller.appspot.com/bug?extid=38e7237add3712479d65
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16830dc1600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11f2d3fa600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+38e7237add3712479d65@...kaller.appspotmail.com

keytouch 0003:0926:3333.0001: implement() called with too large value 32769  
(n: 1)! (kworker/0:1)
------------[ cut here ]------------
WARNING: CPU: 0 PID: 12 at drivers/hid/hid-core.c:1370  
implement.cold+0x40/0x81 drivers/hid/hid-core.c:1370
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: events hidinput_led_worker
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0xca/0x13e lib/dump_stack.c:113
  panic+0x2a3/0x6da kernel/panic.c:219
  __warn.cold+0x20/0x4a kernel/panic.c:576
  report_bug+0x262/0x2a0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:179 [inline]
  fixup_bug arch/x86/kernel/traps.c:174 [inline]
  do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
  do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
  invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:implement.cold+0x40/0x81 drivers/hid/hid-core.c:1370
Code: 00 ef 01 00 48 c7 c2 a0 ac 52 86 48 c7 c6 c0 8a 52 86 4c 8d 88 70 06  
00 00 e8 3f 3b 1a fe 48 c7 c7 20 8b 52 86 e8 fc 4e d7 fc <0f> 0b 44 21 e5  
e9 06 3a ff ff e8 64 ad ec fc 49 8d bd 28 19 00 00
RSP: 0018:ffff8881da20fb88 EFLAGS: 00010082
RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81288ddd RDI: ffffed103b441f63
RBP: 0000000000008001 R08: 0000000000000024 R09: ffffed103b643ee7
R10: ffffed103b643ee6 R11: ffff8881db21f737 R12: 0000000000000001
R13: ffff8881d28d8000 R14: 0000000000000001 R15: 0000000000000001
  hid_output_field drivers/hid/hid-core.c:1543 [inline]
  hid_output_report+0x2dc/0x4c0 drivers/hid/hid-core.c:1562
  __usbhid_submit_report drivers/hid/usbhid/hid-core.c:593 [inline]
  usbhid_submit_report+0x65c/0xde0 drivers/hid/usbhid/hid-core.c:638
  usbhid_request+0x3c/0x70 drivers/hid/usbhid/hid-core.c:1252
  hidinput_led_worker+0xbd/0x360 drivers/hid/hid-input.c:1495
  process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
  worker_thread+0x96/0xe20 kernel/workqueue.c:2415
  kthread+0x318/0x420 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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