linux-kernel - Re: (subset) [syzbot] [input?] [usb?] UBSAN: shift-out-of-bounds in s32ton (2)

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Message-Id: <175285492024.272050.11219945704830043047.b4-ty@kernel.org>
Date: Fri, 18 Jul 2025 18:08:40 +0200
From: Benjamin Tissoires <bentiss@...nel.org>
To: syzbot <syzbot+b63d677d63bcac06cf90@...kaller.appspotmail.com>, 
 Alan Stern <stern@...land.harvard.edu>
Cc: jikos@...nel.org, linux-input@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
 syzkaller-bugs@...glegroups.com
Subject: Re: (subset) [syzbot] [input?] [usb?] UBSAN: shift-out-of-bounds
 in s32ton (2)

On Tue, 15 Jul 2025 15:29:25 -0400, Alan Stern wrote:
> On Mon, Jul 14, 2025 at 10:10:32AM -0700, syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    b4b4dbfa96de media: stk1160: use usb_alloc_noncoherent/usb..
> > git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> > console output: https://syzkaller.appspot.com/x/log.txt?x=15a830f0580000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=28729dff5d03ad1
> > dashboard link: https://syzkaller.appspot.com/bug?extid=b63d677d63bcac06cf90
> > compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1614418c580000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1257dd82580000
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/7301552ad828/disk-b4b4dbfa.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/c559b38fa1b6/vmlinux-b4b4dbfa.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/9c1da8b2a83f/bzImage-b4b4dbfa.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+b63d677d63bcac06cf90@...kaller.appspotmail.com
> >
> > usb 4-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor, different from the interface descriptor's value: 9
> > usb 4-1: New USB device found, idVendor=045e, idProduct=07da, bcdDevice= 0.00
> > usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > usb 4-1: config 0 descriptor??
> > microsoft 0003:045E:07DA.0001: ignoring exceeding usage max
> > microsoft 0003:045E:07DA.0001: unsupported Resolution Multiplier 0
> > ------------[ cut here ]------------
> > UBSAN: shift-out-of-bounds in drivers/hid/hid-core.c:69:16
> > shift exponent 4294967295 is too large for 32-bit type 'int'
> > CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.16.0-rc4-syzkaller-00314-gb4b4dbfa96de #0 PREEMPT(voluntary)
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
> > Workqueue: usb_hub_wq hub_event
> > Call Trace:
> >  <TASK>
> >  __dump_stack lib/dump_stack.c:94 [inline]
> >  dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
> >  ubsan_epilogue lib/ubsan.c:233 [inline]
> >  __ubsan_handle_shift_out_of_bounds+0x27f/0x420 lib/ubsan.c:494
> >  s32ton.cold+0x37/0x9c drivers/hid/hid-core.c:69
> >  hid_output_field drivers/hid/hid-core.c:1841 [inline]
> >  hid_output_report+0x36f/0x4a0 drivers/hid/hid-core.c:1874
> >  __hid_request+0x1e0/0x3c0 drivers/hid/hid-core.c:1987
> >  hidinput_change_resolution_multipliers drivers/hid/hid-input.c:1950 [inline]
> >  hidinput_connect+0x1ada/0x2bd0 drivers/hid/hid-input.c:2327
> 
> [...]

Applied to hid/hid.git (for-6.17/core), thanks!

[1/1] HID: core: Reject report fields with a size or count of 0
      https://git.kernel.org/hid/hid/c/bcf266ca2779

Cheers,
-- 
Benjamin Tissoires <bentiss@...nel.org>