================================================================== BUG: KASAN: slab-out-of-bounds in mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948 Read of size 1 at addr ffff888111ffbfff by task syz.0.3948/18364 CPU: 0 UID: 0 PID: 18364 Comm: syz.0.3948 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 mcp2221_raw_event+0x1070/0x10a0 drivers/hid/hid-mcp2221.c:948 __hid_input_report.constprop.0+0x314/0x450 drivers/hid/hid-core.c:2130 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:286 __usb_hcd_giveback_urb+0x38b/0x610 drivers/usb/core/hcd.c:1661 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745 dummy_timer+0x1809/0x3a00 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842 handle_softirqs+0x208/0x8d0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 56 f2 19 fa 48 89 df e8 3e 46 1a fa f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 a5 9c 0d fa 65 8b 05 5e 3e 52 05 85 c0 74 16 5b RSP: 0018:ffffc9000358fcb8 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffff88811fa70008 RCX: ffffffff8185d4ef RDX: 0000000000000000 RSI: ffffffff88d28e94 RDI: ffffffff878966e0 RBP: 0000000000000283 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8a9d90d7 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88811fa70190 R15: ffffc9000358fd30 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] raw_process_ep_io+0x7fa/0xc30 drivers/usb/gadget/legacy/raw_gadget.c:1139 raw_ioctl_ep_write drivers/usb/gadget/legacy/raw_gadget.c:1152 [inline] raw_ioctl+0xaab/0x2c30 drivers/usb/gadget/legacy/raw_gadget.c:1324 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f10232ceacb Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 RSP: 002b:00007f1021d35f70 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f10232ceacb RDX: 00007f1021d35ff0 RSI: 0000000040085507 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007f1023650320 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000200000000040 R13: 0000000000000000 R14: 00007f1023525fa0 R15: 00007fffdc509fe8 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888111ff8000 pfn:0x111ff8 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x200000000000040(head|node=0|zone=2) page_type: f8(unknown) raw: 0200000000000040 0000000000000000 dead000000000122 0000000000000000 raw: ffff888111ff8000 0000000000000000 00000000f8000000 0000000000000000 head: 0200000000000040 0000000000000000 dead000000000122 0000000000000000 head: ffff888111ff8000 0000000000000000 00000000f8000000 0000000000000000 head: 0200000000000002 ffffea000447fe01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x429c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_ZERO|__GFP_COMP), pid 13509, tgid 13509 (kworker/0:8), ts 1906091490432, free_ts 1902297490586 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0xf98/0x2ce0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x259/0x21e0 mm/page_alloc.c:5148 alloc_pages_mpol+0xe4/0x410 mm/mempolicy.c:2416 ___kmalloc_large_node+0xed/0x160 mm/slub.c:4317 __kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:4348 __do_kmalloc_node mm/slub.c:4364 [inline] __kvmalloc_node_noprof.cold+0xb/0x65 mm/slub.c:5067 hid_register_field drivers/hid/hid-core.c:130 [inline] hid_add_field+0x51f/0x14a0 drivers/hid/hid-core.c:337 hid_parser_main+0x24d/0xe50 drivers/hid/hid-core.c:655 hid_open_report+0x459/0x830 drivers/hid/hid-core.c:1332 __hid_device_probe drivers/hid/hid-core.c:2742 [inline] hid_device_probe+0x5ed/0x720 drivers/hid/hid-core.c:2777 call_driver_probe drivers/base/dd.c:581 [inline] really_probe+0x241/0xa90 drivers/base/dd.c:659 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:801 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831 __device_attach_driver+0x1df/0x310 drivers/base/dd.c:959 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462 page last free pid 9239 tgid 9239 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0x78a/0xfd0 mm/page_alloc.c:2895 discard_slab mm/slub.c:2758 [inline] __put_partials+0x165/0x1c0 mm/slub.c:3223 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x4e/0x70 mm/kasan/common.c:340 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4191 [inline] slab_alloc_node mm/slub.c:4240 [inline] kmem_cache_alloc_noprof+0x14f/0x3b0 mm/slub.c:4247 getname_flags.part.0+0x4c/0x550 fs/namei.c:146 getname_flags+0x93/0xf0 include/linux/audit.h:322 getname include/linux/fs.h:2919 [inline] do_sys_openat2+0xb8/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888111ffbe80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff888111ffbf00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe >ffff888111ffbf80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ ffff888111ffc000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888111ffc080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: f5 cmc 1: 53 push %rbx 2: 48 8b 74 24 10 mov 0x10(%rsp),%rsi 7: 48 89 fb mov %rdi,%rbx a: 48 83 c7 18 add $0x18,%rdi e: e8 56 f2 19 fa call 0xfa19f269 13: 48 89 df mov %rbx,%rdi 16: e8 3e 46 1a fa call 0xfa1a4659 1b: f7 c5 00 02 00 00 test $0x200,%ebp 21: 75 23 jne 0x46 23: 9c pushf 24: 58 pop %rax 25: f6 c4 02 test $0x2,%ah 28: 75 37 jne 0x61 * 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction 2f: e8 a5 9c 0d fa call 0xfa0d9cd9 34: 65 8b 05 5e 3e 52 05 mov %gs:0x5523e5e(%rip),%eax # 0x5523e99 3b: 85 c0 test %eax,%eax 3d: 74 16 je 0x55 3f: 5b pop %rbx