================================================================== BUG: KASAN: use-after-free in mcp2221_raw_event+0x10b0/0x12a0 drivers/hid/hid-mcp2221.c:964 Read of size 1 at addr ffff8880483b3fff by task syz-executor/15905 CPU: 0 UID: 0 PID: 15905 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 mcp2221_raw_event+0x10b0/0x12a0 drivers/hid/hid-mcp2221.c:964 __hid_input_report+0x41c/0x580 drivers/hid/hid-core.c:2168 hid_irq_in+0x492/0x710 drivers/hid/usbhid/hid-core.c:287 __usb_hcd_giveback_urb+0x374/0x530 drivers/usb/core/hcd.c:1657 dummy_timer+0xa91/0x4cf0 drivers/usb/gadget/udc/dummy_hcd.c:2019 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113 handle_softirqs+0x225/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:xt_table_unlock+0x4/0x70 net/netfilter/x_tables.c:1394 Code: ec 0c 90 4c 89 fe e8 3b 94 03 fb e9 58 ff ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <41> 56 53 48 89 fb e8 91 31 ba f7 48 8b 3d 82 a0 4b 06 48 83 c3 30 RSP: 0018:ffffc90002e57838 EFLAGS: 00000246 RAX: 1ffff1100ae35375 RBX: fffff520005caf14 RCX: dffffc0000000000 RDX: 0000000000000006 RSI: ffffffff8e228edb RDI: ffff8880571a9b80 RBP: ffffc90002e57b98 R08: ffffffff90574837 R09: 1ffffffff20ae906 R10: dffffc0000000000 R11: fffffbfff20ae907 R12: ffff8880571a9ba8 R13: ffffc90004481000 R14: 0000000000000000 R15: ffff8880571a9b80 get_entries net/ipv4/netfilter/ip_tables.c:1026 [inline] do_ipt_get_ctl+0xf90/0x1300 net/ipv4/netfilter/ip_tables.c:1669 nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x19e/0x230 net/ipv4/ip_sockglue.c:1777 do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2474 __sys_getsockopt net/socket.c:2505 [inline] __do_sys_getsockopt net/socket.c:2512 [inline] __se_sys_getsockopt net/socket.c:2509 [inline] __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2509 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7604f9f8aa Code: 48 83 ec 10 89 d2 48 63 ff 45 31 c9 6a 2a 45 31 c0 31 c9 e8 d8 99 fb ff 48 83 c4 18 c3 0f 1f 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7 RSP: 002b:00007f760534f6b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007f760534f740 RCX: 00007f7604f9f8aa RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007f760534f6dc R09: 0000000000000000 R10: 00007f760534f740 R11: 0000000000000202 R12: 00007f76051f1400 R13: 00007f760534f6dc R14: 0000000000000000 R15: 00007f76051f2180 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x200000000 pfn:0x483b3 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000200000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0x6cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_RETRY_MAYFAIL), pid 18862, tgid 18861 (syz.4.3939), ts 907309293530, free_ts 910631037718 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 __alloc_pages_noprof+0x10/0x100 mm/page_alloc.c:5338 alloc_pages_bulk_noprof+0x5f5/0x7b0 mm/page_alloc.c:5230 ___alloc_pages_bulk mm/kasan/shadow.c:345 [inline] __kasan_populate_vmalloc_do mm/kasan/shadow.c:370 [inline] __kasan_populate_vmalloc+0xb7/0x1c0 mm/kasan/shadow.c:424 kasan_populate_vmalloc include/linux/kasan.h:580 [inline] alloc_vmap_area+0xd1a/0x1420 mm/vmalloc.c:2145 __get_vm_area_node+0x1f2/0x300 mm/vmalloc.c:3248 __vmalloc_node_range_noprof+0x358/0x1730 mm/vmalloc.c:4064 __bpf_map_area_alloc kernel/bpf/syscall.c:405 [inline] bpf_map_area_alloc+0x12d/0x170 kernel/bpf/syscall.c:412 prealloc_init+0x11a/0x650 kernel/bpf/hashtab.c:327 htab_map_alloc+0x6a0/0xc90 kernel/bpf/hashtab.c:639 map_create_alloc kernel/bpf/syscall.c:1523 [inline] map_create+0xf2a/0x1b90 kernel/bpf/syscall.c:1640 __sys_bpf+0xaea/0xd90 kernel/bpf/syscall.c:6395 __do_sys_bpf kernel/bpf/syscall.c:6537 [inline] __se_sys_bpf kernel/bpf/syscall.c:6534 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6534 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 page last free pid 124 tgid 124 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xc1e/0xd10 mm/page_alloc.c:2950 kasan_depopulate_vmalloc_pte+0x6d/0x90 mm/kasan/shadow.c:484 apply_to_pte_range mm/memory.c:3338 [inline] apply_to_pmd_range mm/memory.c:3382 [inline] apply_to_pud_range mm/memory.c:3418 [inline] apply_to_p4d_range mm/memory.c:3454 [inline] __apply_to_page_range+0xbd8/0x1420 mm/memory.c:3490 __kasan_release_vmalloc+0xa2/0xd0 mm/kasan/shadow.c:602 kasan_release_vmalloc include/linux/kasan.h:593 [inline] kasan_release_vmalloc_node mm/vmalloc.c:2306 [inline] purge_vmap_node+0x220/0x960 mm/vmalloc.c:2328 __purge_vmap_area_lazy+0x783/0xb40 mm/vmalloc.c:2418 drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2452 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff8880483b3e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880483b3f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8880483b3f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880483b4000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880483b4080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: ec in (%dx),%al 1: 0c 90 or $0x90,%al 3: 4c 89 fe mov %r15,%rsi 6: e8 3b 94 03 fb call 0xfb039446 b: e9 58 ff ff ff jmp 0xffffff68 10: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: f3 0f 1e fa endbr64 * 2a: 41 56 push %r14 <-- trapping instruction 2c: 53 push %rbx 2d: 48 89 fb mov %rdi,%rbx 30: e8 91 31 ba f7 call 0xf7ba31c6 35: 48 8b 3d 82 a0 4b 06 mov 0x64ba082(%rip),%rdi # 0x64ba0be 3c: 48 83 c3 30 add $0x30,%rbx