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UBSAN: shift-out-of-bounds in drivers/media/rc/mceusb.c:704:13
shift exponent 246 is too large for 32-bit type 'unsigned int'
CPU: 0 PID: 14663 Comm: systemd-udevd Not tainted 5.11.0-rc7-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
 mceusb_dev_printdata.cold+0x19/0x1e drivers/media/rc/mceusb.c:704
 mceusb_process_ir_data drivers/media/rc/mceusb.c:1275 [inline]
 mceusb_dev_recv+0x3cf/0x18c0 drivers/media/rc/mceusb.c:1376
 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1656
 usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1726
 dummy_timer+0x11f4/0x32a0 drivers/usb/gadget/udc/dummy_hcd.c:1971
 call_timer_fn+0x1a5/0x630 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x67c/0xa10 kernel/time/timer.c:1731
 __run_timers kernel/time/timer.c:1712 [inline]
 run_timer_softirq+0x80/0x120 kernel/time/timer.c:1744
 __do_softirq+0x1b0/0x944 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x80/0xa0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x110/0x1a0 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x43/0xa0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:lock_acquire+0x1c2/0x6f0 kernel/locking/lockdep.c:5410
Code: f5 da 7e e8 f0 96 ff ff b8 ff ff ff ff 48 83 c4 20 65 0f c1 05 27 f5 da 7e 83 f8 01 4c 8b 54 24 08 0f 85 c4 03 00 00 41 52 9d <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7
RSP: 0018:ffffc90004797790 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 1ffff920008f2ef4 RCX: 0000000000000001
RDX: 1ffff110224a4123 RSI: 0000000000000008 RDI: ffffffff89b795b8
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8a1c25ef
R10: 0000000000000246 R11: 0000000000000001 R12: 0000000000000000
R13: ffffffff87bba988 R14: 0000000000000000 R15: 0000000000000000
 __mutex_lock_common kernel/locking/mutex.c:956 [inline]
 __mutex_lock+0x134/0x10e0 kernel/locking/mutex.c:1103
 kernfs_iop_lookup+0x4a/0x220 fs/kernfs/dir.c:1086
 __lookup_slow+0x24c/0x480 fs/namei.c:1544
 lookup_slow fs/namei.c:1561 [inline]
 walk_component+0x418/0x6a0 fs/namei.c:1861
 lookup_last fs/namei.c:2312 [inline]
 path_lookupat+0x1ba/0x830 fs/namei.c:2336
 filename_lookup+0x19f/0x560 fs/namei.c:2369
 do_readlinkat+0xcd/0x2f0 fs/stat.c:407
 __do_sys_readlinkat fs/stat.c:434 [inline]
 __se_sys_readlinkat fs/stat.c:431 [inline]
 __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:431
 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fe094e0d0ba
Code: 48 8b 0d e1 bd 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 0b 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ae bd 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007fffee08a528 EFLAGS: 00000202 ORIG_RAX: 000000000000010b
RAX: ffffffffffffffda RBX: 000056484ddc4120 RCX: 00007fe094e0d0ba
RDX: 000056484ddc4120 RSI: 00007fffee08a5b0 RDI: 00000000ffffff9c
RBP: 0000000000000064 R08: 0000000000000000 R09: 0000000000000070
R10: 0000000000000063 R11: 0000000000000202 R12: 00007fffee08a5b0
R13: 00000000ffffff9c R14: 00007fffee08a580 R15: 0000000000000063
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