linux-kernel - UBSAN: shift-out-of-bounds in snto32

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Message-ID: <00000000000098361105b6611620@google.com>
Date:   Sun, 13 Dec 2020 15:43:10 -0800
From:   syzbot <syzbot+1e911ad71dd4ea72e04a@...kaller.appspotmail.com>
To:     benjamin.tissoires@...hat.com, jikos@...nel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: UBSAN: shift-out-of-bounds in snto32

Hello,

syzbot found the following issue on:

HEAD commit:    a9e26cb5 Add linux-next specific files for 20201208
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1198c937500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e259434a8eaf0206
dashboard link: https://syzkaller.appspot.com/bug?extid=1e911ad71dd4ea72e04a
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13ba5f07500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=122a9613500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1e911ad71dd4ea72e04a@...kaller.appspotmail.com

================================================================================
UBSAN: shift-out-of-bounds in drivers/hid/hid-core.c:1315:20
shift exponent 4294967295 is too large for 32-bit type 'int'
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc7-next-20201208-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395
 snto32.cold+0x37/0x3c drivers/hid/hid-core.c:1315
 hid_input_field drivers/hid/hid-core.c:1548 [inline]
 hid_report_raw_event+0x7a9/0x11b0 drivers/hid/hid-core.c:1783
 hid_input_report+0x360/0x4c0 drivers/hid/hid-core.c:1850
 hid_irq_in+0x50e/0x690 drivers/hid/usbhid/hid-core.c:284
 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1657
 usb_hcd_giveback_urb+0x38c/0x430 drivers/usb/core/hcd.c:1728
 dummy_timer+0x11f4/0x32a0 drivers/usb/gadget/udc/dummy_hcd.c:1971
 call_timer_fn+0x1a5/0x710 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x692/0xa80 kernel/time/timer.c:1731


---
This report is generated by a bot. It may contain errors.
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