Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 16 Sep 2019 13:03:23 -0700 (PDT)
From:   David Rientjes <rientjes@google.com>
To:     syzbot <syzbot+38e7237add3712479d65@syzkaller.appspotmail.com>
cc:     andreyknvl@google.com, benjamin.tissoires@redhat.com,
        jikos@kernel.org, linux-input@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
        syzkaller-bugs@googlegroups.com
Subject: Re: WARNING in implement
In-Reply-To: <0000000000002b27c60592b00f38@google.com>
Message-ID: <alpine.DEB.2.21.1909161302370.118156@chino.kir.corp.google.com>
References: <0000000000002b27c60592b00f38@google.com>
User-Agent: Alpine 2.21 (DEB 202 2017-01-01)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, 16 Sep 2019, syzbot wrote:

> 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@syzkaller.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

I assume this is the same issue as 
https://marc.info/?l=linux-kernel&m=156865976021549 and any fix for that 
issue would apply to this one as well.  Looks like syzbot found Benjamin 
and Jiri already.