================================================================== BUG: KASAN: use-after-free in nfc_llcp_find_local+0xcf/0xe0 net/nfc/llcp_core.c:285 Read of size 8 at addr ffff8880765d0000 by task syz-executor.1/21762 CPU: 1 PID: 21762 Comm: syz-executor.1 Not tainted 6.1.0-rc6-next-20221125-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:253 [inline] print_report+0x15e/0x45d mm/kasan/report.c:364 kasan_report+0xbf/0x1f0 mm/kasan/report.c:464 nfc_llcp_find_local+0xcf/0xe0 net/nfc/llcp_core.c:285 nfc_llcp_unregister_device+0x1a/0x260 net/nfc/llcp_core.c:1610 nfc_unregister_device+0x196/0x330 net/nfc/core.c:1179 virtual_ncidev_close+0x52/0xb0 drivers/nfc/virtual_ncidev.c:163 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe7de43df8b 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:00007fff7e5d0830 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007fe7de43df8b RDX: 0000000000000000 RSI: 0000001b2f226ef4 RDI: 0000000000000003 RBP: 00007fe7de5ad980 R08: 0000000000000000 R09: 0000000008337a43 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000003c192 R13: 00007fff7e5d0930 R14: 00007fe7de5abf80 R15: 0000000000000032 Allocated by task 21775: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:376 [inline] ____kasan_kmalloc mm/kasan/common.c:335 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:385 kmalloc include/linux/slab.h:571 [inline] kzalloc include/linux/slab.h:711 [inline] nfc_llcp_register_device+0x49/0x9e0 net/nfc/llcp_core.c:1566 nfc_register_device+0x70/0x3b0 net/nfc/core.c:1124 nci_register_device+0x7cb/0xb50 net/nfc/nci/core.c:1257 virtual_ncidev_open+0x14f/0x230 drivers/nfc/virtual_ncidev.c:148 misc_open+0x37a/0x4a0 drivers/char/misc.c:165 chrdev_open+0x26a/0x770 fs/char_dev.c:414 do_dentry_open+0x6cc/0x13f0 fs/open.c:882 do_open fs/namei.c:3557 [inline] path_openat+0x1bbc/0x2a50 fs/namei.c:3714 do_filp_open+0x1ba/0x410 fs/namei.c:3741 do_sys_openat2+0x16d/0x4c0 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+0x143/0x1f0 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 21772: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:241 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:205 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1763 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1789 slab_free mm/slub.c:3696 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3709 local_release net/nfc/llcp_core.c:173 [inline] kref_put include/linux/kref.h:65 [inline] nfc_llcp_local_put net/nfc/llcp_core.c:181 [inline] nfc_llcp_local_put net/nfc/llcp_core.c:176 [inline] nfc_llcp_unregister_device+0x1ba/0x260 net/nfc/llcp_core.c:1619 nfc_unregister_device+0x196/0x330 net/nfc/core.c:1179 virtual_ncidev_close+0x52/0xb0 drivers/nfc/virtual_ncidev.c:163 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x693/0x13b0 kernel/workqueue.c:1517 queue_work_on+0xf2/0x110 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] schedule_work include/linux/workqueue.h:564 [inline] rfkill_register+0x67c/0xb00 net/rfkill/core.c:1090 nfc_register_device+0x124/0x3b0 net/nfc/core.c:1132 nci_register_device+0x7cb/0xb50 net/nfc/nci/core.c:1257 virtual_ncidev_open+0x14f/0x230 drivers/nfc/virtual_ncidev.c:148 misc_open+0x37a/0x4a0 drivers/char/misc.c:165 chrdev_open+0x26a/0x770 fs/char_dev.c:414 do_dentry_open+0x6cc/0x13f0 fs/open.c:882 do_open fs/namei.c:3557 [inline] path_openat+0x1bbc/0x2a50 fs/namei.c:3714 do_filp_open+0x1ba/0x410 fs/namei.c:3741 do_sys_openat2+0x16d/0x4c0 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+0x143/0x1f0 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x693/0x13b0 kernel/workqueue.c:1517 queue_work_on+0xf2/0x110 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] schedule_work include/linux/workqueue.h:564 [inline] rfkill_register+0x67c/0xb00 net/rfkill/core.c:1090 nfc_register_device+0x124/0x3b0 net/nfc/core.c:1132 nci_register_device+0x7cb/0xb50 net/nfc/nci/core.c:1257 virtual_ncidev_open+0x14f/0x230 drivers/nfc/virtual_ncidev.c:148 misc_open+0x37a/0x4a0 drivers/char/misc.c:165 chrdev_open+0x26a/0x770 fs/char_dev.c:414 do_dentry_open+0x6cc/0x13f0 fs/open.c:882 do_open fs/namei.c:3557 [inline] path_openat+0x1bbc/0x2a50 fs/namei.c:3714 do_filp_open+0x1ba/0x410 fs/namei.c:3741 do_sys_openat2+0x16d/0x4c0 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+0x143/0x1f0 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff8880765d0000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of 2048-byte region [ffff8880765d0000, ffff8880765d0800) The buggy address belongs to the physical page: page:ffffea0001d97400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x765d0 head:ffffea0001d97400 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012442000 ffffea00017cf400 dead000000000002 raw: 0000000000000000 0000000080080008 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 5317, tgid 5317 (syz-executor.3), ts 88511557138, free_ts 88441802170 prep_new_page mm/page_alloc.c:2541 [inline] get_page_from_freelist+0x119c/0x2cd0 mm/page_alloc.c:4293 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5551 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1833 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1980 new_slab mm/slub.c:2033 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3211 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3310 slab_alloc_node mm/slub.c:3395 [inline] __kmem_cache_alloc_node+0x1a9/0x430 mm/slub.c:3472 kmalloc_trace+0x26/0x60 mm/slab_common.c:1049 kmalloc include/linux/slab.h:571 [inline] rtnl_newlink+0x4a/0xa0 net/core/rtnetlink.c:3633 rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6141 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2564 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1356 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1932 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 __sys_sendto+0x23a/0x340 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2125 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1448 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1498 free_unref_page_prepare mm/page_alloc.c:3379 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3474 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:307 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3433 [inline] slab_alloc mm/slub.c:3441 [inline] __kmem_cache_alloc_lru mm/slub.c:3448 [inline] kmem_cache_alloc+0x1e3/0x430 mm/slub.c:3457 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139 getname_flags include/linux/audit.h:320 [inline] getname+0x92/0xd0 fs/namei.c:218 do_sys_openat2+0xf5/0x4c0 fs/open.c:1304 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+0x143/0x1f0 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff8880765cff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880765cff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880765d0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880765d0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880765d0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================