================================================================== BUG: KASAN: slab-use-after-free in nfc_llcp_find_local+0xcf/0xe0 net/nfc/llcp_core.c:286 Read of size 8 at addr ffff8880204f3000 by task syz-executor.3/22599 CPU: 3 PID: 22599 Comm: syz-executor.3 Not tainted 6.3.0-syzkaller-10620-g33afd4b76393 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 nfc_llcp_find_local+0xcf/0xe0 net/nfc/llcp_core.c:286 nfc_llcp_unregister_device+0x1a/0x260 net/nfc/llcp_core.c:1611 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:321 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+0x210/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f7c47c8c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7c4891b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000021 RAX: 0000000000000003 RBX: 00007f7c47dabf80 RCX: 00007f7c47c8c169 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00007f7c47ce7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc424cfa6f R14: 00007f7c4891b300 R15: 0000000000022000 Allocated by task 22607: 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:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] nfc_llcp_register_device+0x49/0x9e0 net/nfc/llcp_core.c:1567 nfc_register_device+0x70/0x3c0 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:920 do_open fs/namei.c:3560 [inline] path_openat+0x1baa/0x2750 fs/namei.c:3715 do_filp_open+0x1ba/0x410 fs/namei.c:3742 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1383 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 22607: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] __cache_free mm/slab.c:3389 [inline] __do_kmem_cache_free mm/slab.c:3576 [inline] __kmem_cache_free+0xcd/0x2c0 mm/slab.c:3583 local_release net/nfc/llcp_core.c:174 [inline] kref_put include/linux/kref.h:65 [inline] nfc_llcp_local_put net/nfc/llcp_core.c:182 [inline] nfc_llcp_local_put net/nfc/llcp_core.c:177 [inline] nfc_llcp_unregister_device+0x1ba/0x260 net/nfc/llcp_core.c:1620 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:321 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+0x210/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 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+0x7b/0x90 mm/kasan/generic.c:491 insert_work+0x48/0x350 kernel/workqueue.c:1361 __queue_work+0x625/0x1120 kernel/workqueue.c:1524 queue_work_on+0xf2/0x110 kernel/workqueue.c:1552 queue_work include/linux/workqueue.h:504 [inline] schedule_work include/linux/workqueue.h:565 [inline] rfkill_register+0x67c/0xb00 net/rfkill/core.c:1090 nfc_register_device+0x124/0x3c0 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:920 do_open fs/namei.c:3560 [inline] path_openat+0x1baa/0x2750 fs/namei.c:3715 do_filp_open+0x1ba/0x410 fs/namei.c:3742 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1383 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+0x7b/0x90 mm/kasan/generic.c:491 insert_work+0x48/0x350 kernel/workqueue.c:1361 __queue_work+0x625/0x1120 kernel/workqueue.c:1524 queue_work_on+0xf2/0x110 kernel/workqueue.c:1552 queue_work include/linux/workqueue.h:504 [inline] nci_send_cmd+0x247/0x360 net/nfc/nci/core.c:1377 nci_reset_req+0x76/0xa0 net/nfc/nci/core.c:167 __nci_request+0x87/0x2d0 net/nfc/nci/core.c:108 nci_open_device net/nfc/nci/core.c:503 [inline] nci_dev_up+0x2af/0x660 net/nfc/nci/core.c:632 nfc_dev_up+0x1aa/0x3c0 net/nfc/core.c:118 nfc_genl_dev_up+0xa6/0xf0 net/nfc/netlink.c:770 genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 net/netlink/genetlink.c:968 genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline] genl_rcv_msg+0x4ff/0x7e0 net/netlink/genetlink.c:1065 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2503 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586 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 ffff8880204f3000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes inside of freed 2048-byte region [ffff8880204f3000, ffff8880204f3800) The buggy address belongs to the physical page: page:ffffea0000813cc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x204f3 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x1() raw: 00fff00000000200 ffff888012440800 ffffea0000739d10 ffffea000063cc50 raw: 0000000000000000 ffff8880204f3000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x3420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 14750, tgid 14748 (syz-executor.2), ts 283154155035, free_ts 276063636167 prep_new_page mm/page_alloc.c:1729 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3493 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4759 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1360 [inline] cache_grow_begin+0x9b/0x3b0 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3018 [inline] ____cache_alloc mm/slab.c:3001 [inline] __do_cache_alloc mm/slab.c:3201 [inline] slab_alloc_node mm/slab.c:3249 [inline] __kmem_cache_alloc_node+0x360/0x3f0 mm/slab.c:3540 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] nfc_llcp_register_device+0x49/0x9e0 net/nfc/llcp_core.c:1567 nfc_register_device+0x70/0x3c0 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:920 do_open fs/namei.c:3560 [inline] path_openat+0x1baa/0x2750 fs/namei.c:3715 do_filp_open+0x1ba/0x410 fs/namei.c:3742 do_sys_openat2+0x16d/0x4c0 fs/open.c:1356 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x629/0xca0 mm/page_alloc.c:2555 free_unref_page+0x33/0x370 mm/page_alloc.c:2650 slab_destroy mm/slab.c:1612 [inline] slabs_destroy+0x85/0xc0 mm/slab.c:1632 cache_flusharray mm/slab.c:3360 [inline] ___cache_free+0x2ae/0x3d0 mm/slab.c:3423 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x4f/0x1a0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:711 [inline] slab_alloc_node mm/slab.c:3256 [inline] __kmem_cache_alloc_node+0x1fc/0x3f0 mm/slab.c:3540 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] audit_log_d_path+0xd2/0x1e0 kernel/audit.c:2134 audit_log_d_path_exe+0x44/0x70 kernel/audit.c:2205 audit_log_task+0x278/0x300 kernel/auditsc.c:2957 audit_seccomp+0x7a/0x290 kernel/auditsc.c:3004 seccomp_log kernel/seccomp.c:994 [inline] __seccomp_filter+0x8fc/0x1080 kernel/seccomp.c:1312 __secure_computing+0x24a/0x3e0 kernel/seccomp.c:1342 syscall_trace_enter.constprop.0+0x90/0x1e0 kernel/entry/common.c:72 Memory state around the buggy address: ffff8880204f2f00: fb fb fb fb fb fb fc fc fc fc fb fb fb fb fb fb ffff8880204f2f80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880204f3000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880204f3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880204f3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================