================================================================== BUG: KASAN: use-after-free in nfc_llcp_unregister_device+0x65/0x1d0 net/nfc/llcp_core.c:1611 Read of size 8 at addr ffff88802911f000 by task syz-executor.0/17447 CPU: 0 PID: 17447 Comm: syz-executor.0 Not tainted 6.2.0-rc5-syzkaller-00013-g2475bf0250de #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:306 print_report+0x107/0x1f0 mm/kasan/report.c:417 kasan_report+0xcd/0x100 mm/kasan/report.c:517 nfc_llcp_unregister_device+0x65/0x1d0 net/nfc/llcp_core.c:1611 nfc_unregister_device+0x18a/0x290 net/nfc/core.c:1179 virtual_ncidev_close+0x55/0x90 drivers/nfc/virtual_ncidev.c:163 __fput+0x3ba/0x880 fs/file_table.c:320 task_work_run+0x243/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4fb723df7b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007fffff5a13b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00007f4fb723df7b RDX: 00007f4fb6e08558 RSI: ffffffffffffffff RDI: 0000000000000005 RBP: 00007f4fb73ad980 R08: 0000000000000000 R09: 00007f4fb6e00000 R10: 00007f4fb6e08560 R11: 0000000000000293 R12: 00000000000dabfb R13: 00007fffff5a14b0 R14: 00007f4fb73abf80 R15: 0000000000000032 Allocated by task 17456: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] nfc_llcp_register_device+0x51/0x800 net/nfc/llcp_core.c:1567 nfc_register_device+0x68/0x320 net/nfc/core.c:1124 nci_register_device+0x7b5/0x8f0 net/nfc/nci/core.c:1257 virtual_ncidev_open+0x138/0x1b0 drivers/nfc/virtual_ncidev.c:148 misc_open+0x346/0x3c0 drivers/char/misc.c:165 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x85f/0x11b0 fs/open.c:882 do_open fs/namei.c:3557 [inline] path_openat+0x25ba/0x2dd0 fs/namei.c:3714 do_filp_open+0x264/0x4f0 fs/namei.c:3741 do_sys_openat2+0x124/0x4e0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 17455: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x71/0x110 mm/slub.c:3800 local_release net/nfc/llcp_core.c:174 [inline] kref_put include/linux/kref.h:65 [inline] nfc_llcp_local_put+0x223/0x250 net/nfc/llcp_core.c:182 nfc_unregister_device+0x18a/0x290 net/nfc/core.c:1179 virtual_ncidev_close+0x55/0x90 drivers/nfc/virtual_ncidev.c:163 __fput+0x3ba/0x880 fs/file_table.c:320 task_work_run+0x243/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88802911f000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of 2048-byte region [ffff88802911f000, ffff88802911f800) The buggy address belongs to the physical page: page:ffffea0000a44600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29118 head:ffffea0000a44600 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012842000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5113, tgid 5113 (syz-executor.2), ts 165903991489, free_ts 165895935261 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0xbd/0x190 mm/slub.c:1851 allocate_slab+0x5e/0x3c0 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x782/0xe20 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x25b/0x340 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node+0x9e/0x190 mm/slab_common.c:975 kmalloc_node include/linux/slab.h:610 [inline] kzalloc_node include/linux/slab.h:731 [inline] qdisc_alloc+0x8e/0x940 net/sched/sch_generic.c:938 qdisc_create_dflt+0x6c/0x2a0 net/sched/sch_generic.c:996 attach_one_default_qdisc net/sched/sch_generic.c:1151 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2464 [inline] attach_default_qdiscs net/sched/sch_generic.c:1169 [inline] dev_activate+0x353/0x1250 net/sched/sch_generic.c:1228 __dev_open+0x3f1/0x510 net/core/dev.c:1426 __dev_change_flags+0x1e0/0x6d0 net/core/dev.c:8530 dev_change_flags+0x85/0x190 net/core/dev.c:8602 do_setlink+0xef5/0x3d40 net/core/rtnetlink.c:2827 __rtnl_newlink net/core/rtnetlink.c:3590 [inline] rtnl_newlink+0x1780/0x2020 net/core/rtnetlink.c:3637 rtnetlink_rcv_msg+0x822/0xf10 net/core/rtnetlink.c:6141 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464 discard_slab mm/slub.c:2098 [inline] __unfreeze_partials+0x1a5/0x1e0 mm/slub.c:2637 put_cpu_partial+0x106/0x170 mm/slub.c:2713 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x1b3/0x350 mm/slub.c:3476 kmem_cache_zalloc include/linux/slab.h:710 [inline] __kernfs_new_node+0xdb/0x730 fs/kernfs/dir.c:614 kernfs_new_node fs/kernfs/dir.c:676 [inline] kernfs_create_dir_ns+0x90/0x220 fs/kernfs/dir.c:1032 sysfs_create_dir_ns+0x159/0x2f0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:63 [inline] kobject_add_internal+0x6dd/0xd10 lib/kobject.c:223 kobject_add_varg lib/kobject.c:358 [inline] kobject_add+0x138/0x200 lib/kobject.c:410 device_add+0x47d/0xf90 drivers/base/core.c:3414 netdev_register_kobject+0x178/0x310 net/core/net-sysfs.c:2015 register_netdevice+0x1043/0x17a0 net/core/dev.c:10045 Memory state around the buggy address: ffff88802911ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802911ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802911f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802911f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802911f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================