================================================================================
UBSAN: array-index-out-of-bounds in drivers/input/tablet/aiptek.c:741:31
index 4775 is out of range for type 'const int[34]'
CPU: 1 PID: 5126 Comm: acpid Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:217
 __ubsan_handle_out_of_bounds+0xe3/0xf0 lib/ubsan.c:348
 aiptek_irq+0x1ea9/0x28f0 drivers/input/tablet/aiptek.c:741
 __usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650
 dummy_timer+0x8de/0x3320 drivers/usb/gadget/udc/dummy_hcd.c:2003
 __run_hrtimer kernel/time/hrtimer.c:1754 [inline]
 __hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1818
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1835
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:unwind_next_frame+0x177/0x2970 arch/x86/kernel/unwind_orc.c:494
Code: 42 0f b6 04 28 84 c0 48 8b 5c 24 20 0f 85 64 21 00 00 45 0f b6 3e 48 8b 44 24 40 42 80 3c 28 00 74 08 48 89 df e8 79 32 a4 00 <48> 8b 1b 49 83 f7 01 48 89 df 4c 89 fe e8 57 f4 4b 00 4c 29 fb 4c
RSP: 0018:ffffc9000325f610 EFLAGS: 00000246
RAX: 1ffff9200064bef2 RBX: ffffc9000325f790 RCX: ffff88807e595a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff813b387e
RBP: ffffc9000325f798 R08: ffff88807e595a00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc9000325f748
R13: dffffc0000000000 R14: ffffc9000325f77d R15: 0000000000000000
 __unwind_start+0x66a/0x7e0 arch/x86/kernel/unwind_orc.c:760
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xf8/0x190 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1811 [inline]
 slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 __kmem_cache_free+0xba/0x1e0 mm/slub.c:3843
 inotify_read+0x4a5/0xa90 fs/notify/inotify/inotify_user.c:275
 vfs_read+0x28b/0x970 fs/read_write.c:468
 ksys_read+0x150/0x260 fs/read_write.c:613
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8895e61407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fff45b03b60 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f8895dd7740 RCX: 00007f8895e61407
RDX: 0000000000000110 RSI: 00007fff45b03cc0 RDI: 0000000000000004
RBP: 00007fff45b03e10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000557f3841d1e4
R13: 00007fff45b03cc0 R14: 0000000000000000 R15: 0000000000000004
 </TASK>
================================================================================
----------------
Code disassembly (best guess):
   0:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
   5:	84 c0                	test   %al,%al
   7:	48 8b 5c 24 20       	mov    0x20(%rsp),%rbx
   c:	0f 85 64 21 00 00    	jne    0x2176
  12:	45 0f b6 3e          	movzbl (%r14),%r15d
  16:	48 8b 44 24 40       	mov    0x40(%rsp),%rax
  1b:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  20:	74 08                	je     0x2a
  22:	48 89 df             	mov    %rbx,%rdi
  25:	e8 79 32 a4 00       	call   0xa432a3
* 2a:	48 8b 1b             	mov    (%rbx),%rbx <-- trapping instruction
  2d:	49 83 f7 01          	xor    $0x1,%r15
  31:	48 89 df             	mov    %rbx,%rdi
  34:	4c 89 fe             	mov    %r15,%rsi
  37:	e8 57 f4 4b 00       	call   0x4bf493
  3c:	4c 29 fb             	sub    %r15,%rbx
  3f:	4c                   	rex.WR