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

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Date:   Tue, 08 Dec 2020 23:33:11 -0800
From:   syzbot <syzbot+8881b478dad0a7971f79@...kaller.appspotmail.com>
To:     gregkh@...uxfoundation.org, johan@...nel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: UBSAN: shift-out-of-bounds in option_probe

Hello,

syzbot found the following issue on:

HEAD commit:    15ac8fdb Add linux-next specific files for 20201207
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17dc6adf500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3696b8138207d24d
dashboard link: https://syzkaller.appspot.com/bug?extid=8881b478dad0a7971f79
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12e89613500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17993623500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8881b478dad0a7971f79@...kaller.appspotmail.com

usb 1-1: config 0 interface 109 has no altsetting 0
usb 1-1: New USB device found, idVendor=12d1, idProduct=02cb, bcdDevice= 1.fb
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
================================================================================
UBSAN: shift-out-of-bounds in drivers/usb/serial/option.c:2120:21
shift exponent 109 is too large for 64-bit type 'long unsigned int'
CPU: 0 PID: 3169 Comm: kworker/0:3 Not tainted 5.10.0-rc6-next-20201207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __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
 option_probe.cold+0x1a/0x1f drivers/usb/serial/option.c:2120
 usb_serial_probe+0x32d/0xef0 drivers/usb/serial/usb-serial.c:905
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 really_probe+0x2b1/0xe40 drivers/base/dd.c:554
 driver_probe_device+0x285/0x3f0 drivers/base/dd.c:738
 __device_attach_driver+0x216/0x2d0 drivers/base/dd.c:844

---
This report 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.

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