================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x8ee/0x333e kernel/locking/lockdep.c:4897 Read of size 8 at addr ffffaf800c3e2018 by task syz-executor.0/2877 CPU: 0 PID: 2877 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119 [] __dump_stack lib/dump_stack.c:88 [inline] [] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106 [] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255 [] __kasan_report mm/kasan/report.c:442 [inline] [] kasan_report+0x184/0x1e0 mm/kasan/report.c:459 [] check_region_inline mm/kasan/generic.c:183 [inline] [] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256 [] __lock_acquire+0x8ee/0x333e kernel/locking/lockdep.c:4897 [] lock_acquire.part.0+0x1d0/0x424 kernel/locking/lockdep.c:5639 [] lock_acquire+0x54/0x6a kernel/locking/lockdep.c:5612 [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] [] _raw_spin_lock_irqsave+0x3e/0x62 kernel/locking/spinlock.c:162 [] rfkill_blocked+0x22/0x62 net/rfkill/core.c:941 [] nfc_dev_up+0x8e/0x26c net/nfc/core.c:102 [] nfc_genl_dev_up+0x5e/0x8a net/nfc/netlink.c:770 [] genl_family_rcv_msg_doit+0x19a/0x23c net/netlink/genetlink.c:731 [] genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] [] genl_rcv_msg+0x236/0x3ba net/netlink/genetlink.c:792 [] netlink_rcv_skb+0xf8/0x2be net/netlink/af_netlink.c:2494 [] genl_rcv+0x36/0x4c net/netlink/genetlink.c:803 [] netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] [] netlink_unicast+0x40e/0x5fe net/netlink/af_netlink.c:1343 [] netlink_sendmsg+0x4e0/0x994 net/netlink/af_netlink.c:1919 [] sock_sendmsg_nosec net/socket.c:705 [inline] [] sock_sendmsg+0xa0/0xc4 net/socket.c:725 [] ____sys_sendmsg+0x46e/0x484 net/socket.c:2413 [] ___sys_sendmsg+0x16c/0x1f6 net/socket.c:2467 [] __sys_sendmsg+0xba/0x150 net/socket.c:2496 [] __do_sys_sendmsg net/socket.c:2505 [inline] [] sys_sendmsg+0x2c/0x3a net/socket.c:2503 [] ret_from_syscall+0x0/0x2 Allocated by task 2869: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0x80/0xb2 mm/kasan/common.c:524 kasan_kmalloc include/linux/kasan.h:270 [inline] __kmalloc+0x190/0x318 mm/slub.c:4424 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:715 [inline] rfkill_alloc+0x96/0x1aa net/rfkill/core.c:983 nfc_register_device+0xe4/0x29e net/nfc/core.c:1129 nci_register_device+0x538/0x612 net/nfc/nci/core.c:1252 virtual_ncidev_open+0x82/0x12c drivers/nfc/virtual_ncidev.c:143 misc_open+0x272/0x2c8 drivers/char/misc.c:141 chrdev_open+0x1d4/0x478 fs/char_dev.c:414 do_dentry_open+0x2a4/0x7d4 fs/open.c:824 vfs_open+0x52/0x5e fs/open.c:959 do_open fs/namei.c:3476 [inline] path_openat+0x12b6/0x189e fs/namei.c:3609 do_filp_open+0x10e/0x22a fs/namei.c:3636 do_sys_openat2+0x174/0x31e fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] sys_openat+0xdc/0x164 fs/open.c:1241 ret_from_syscall+0x0/0x2 Freed by task 2868: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 kasan_set_track+0x1a/0x26 mm/kasan/common.c:45 kasan_set_free_info+0x1e/0x3a mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x15e/0x180 mm/kasan/common.c:328 __kasan_slab_free+0x10/0x18 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8e/0x1cc mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xe0/0x3e4 mm/slub.c:4562 rfkill_release+0x20/0x2a net/rfkill/core.c:831 device_release+0x66/0x148 drivers/base/core.c:2229 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1bc/0x38e lib/kobject.c:753 put_device+0x28/0x3a drivers/base/core.c:3512 rfkill_destroy+0x2a/0x3c net/rfkill/core.c:1142 nfc_unregister_device+0xac/0x232 net/nfc/core.c:1167 nci_unregister_device+0x168/0x182 net/nfc/nci/core.c:1298 virtual_ncidev_close+0x9c/0xbc drivers/nfc/virtual_ncidev.c:163 __fput+0x164/0x502 fs/file_table.c:311 ____fput+0x1a/0x24 fs/file_table.c:344 task_work_run+0xdc/0x154 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] do_notify_resume+0x894/0xa56 arch/riscv/kernel/signal.c:320 ret_from_exception+0x0/0x10 Last potentially related work creation: stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38 __kasan_record_aux_stack+0xc4/0xdc mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xe/0x16 mm/kasan/generic.c:358 insert_work+0x40/0x1d4 kernel/workqueue.c:1368 __queue_work+0x4ec/0xed0 kernel/workqueue.c:1534 queue_work_on+0xe8/0xfe kernel/workqueue.c:1562 queue_work include/linux/workqueue.h:502 [inline] schedule_work include/linux/workqueue.h:563 [inline] rfkill_register+0x46e/0x60e net/rfkill/core.c:1089 nfc_register_device+0x10a/0x29e net/nfc/core.c:1132 nci_register_device+0x538/0x612 net/nfc/nci/core.c:1252 virtual_ncidev_open+0x82/0x12c drivers/nfc/virtual_ncidev.c:143 misc_open+0x272/0x2c8 drivers/char/misc.c:141 chrdev_open+0x1d4/0x478 fs/char_dev.c:414 do_dentry_open+0x2a4/0x7d4 fs/open.c:824 vfs_open+0x52/0x5e fs/open.c:959 do_open fs/namei.c:3476 [inline] path_openat+0x12b6/0x189e fs/namei.c:3609 do_filp_open+0x10e/0x22a fs/namei.c:3636 do_sys_openat2+0x174/0x31e fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] sys_openat+0xdc/0x164 fs/open.c:1241 ret_from_syscall+0x0/0x2 The buggy address belongs to the object at ffffaf800c3e2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 24 bytes inside of 2048-byte region [ffffaf800c3e2000, ffffaf800c3e2800) The buggy address belongs to the page: page:ffffaf807a9ba700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c5e0 head:ffffaf807a9ba700 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x8800010200(slab|head|section=17|node=0|zone=0) raw: 0000008800010200 0000000000000000 0000000000000001 ffffaf8007202000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 raw: 00000000000007ff 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 2065, ts 1474682316200, free_ts 1466906337300 __set_page_owner+0x48/0x136 mm/page_owner.c:183 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x25a/0x2cc mm/slub.c:2004 ___slab_alloc+0x56e/0x918 mm/slub.c:3018 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc_track_caller+0x25a/0x30e mm/slub.c:4926 kmemdup+0x2a/0x5a mm/util.c:128 neigh_sysctl_register+0xb2/0x380 net/core/neighbour.c:3725 addrconf_sysctl_register+0xa4/0x138 net/ipv6/addrconf.c:7074 ipv6_add_dev+0x610/0xa7e net/ipv6/addrconf.c:455 addrconf_notify+0x5e8/0x1360 net/ipv6/addrconf.c:3510 notifier_call_chain+0xb8/0x188 kernel/notifier.c:84 page last free stack trace: __reset_page_owner+0x4a/0xea mm/page_owner.c:142 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x6a/0x31e mm/page_alloc.c:3404 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xe2/0x112 mm/page_alloc.c:5474 __free_slab+0x122/0x27c mm/slub.c:2028 free_slab mm/slub.c:2043 [inline] discard_slab+0x4c/0x7a mm/slub.c:2049 __slab_free+0x20a/0x29c mm/slub.c:3414 do_slab_free mm/slub.c:3497 [inline] ___cache_free+0x17c/0x354 mm/slub.c:3516 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x7c/0x132 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14c/0x1c8 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x5c/0x98 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x338/0x3de mm/slub.c:3243 getname_flags.part.0+0x48/0x2a4 fs/namei.c:138 getname_flags include/linux/audit.h:323 [inline] getname+0x5e/0x90 fs/namei.c:217 do_sys_openat2+0x112/0x31e fs/open.c:1208 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] sys_openat+0xdc/0x164 fs/open.c:1241 Memory state around the buggy address: ffffaf800c3e1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffffaf800c3e1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffffaf800c3e2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffffaf800c3e2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf800c3e2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================