================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3d86/0x54a0 kernel/locking/lockdep.c:4885 Read of size 8 at addr ffff888012bd9120 by task kworker/0:0/6543 CPU: 0 PID: 6543 Comm: kworker/0:0 Not tainted 5.15.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __lock_acquire+0x3d86/0x54a0 kernel/locking/lockdep.c:4885 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 lock_sock_nested+0x2f/0xf0 net/core/sock.c:3203 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1528 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:622 l2cap_chan_close+0x1b9/0xaf0 net/bluetooth/l2cap_core.c:825 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 13996: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa1/0xd0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __do_kmalloc mm/slab.c:3702 [inline] __kmalloc+0x214/0x4d0 mm/slab.c:3711 kmalloc include/linux/slab.h:596 [inline] sk_prot_alloc+0x110/0x290 net/core/sock.c:1839 sk_alloc+0x30/0xa60 net/core/sock.c:1892 l2cap_sock_alloc.constprop.0+0x31/0x230 net/bluetooth/l2cap_sock.c:1813 l2cap_sock_create+0x123/0x1f0 net/bluetooth/l2cap_sock.c:1859 bt_sock_create+0x17c/0x340 net/bluetooth/af_bluetooth.c:130 __sock_create+0x353/0x790 net/socket.c:1464 sock_create net/socket.c:1515 [inline] __sys_socket+0xef/0x200 net/socket.c:1557 __do_sys_socket net/socket.c:1566 [inline] __se_sys_socket net/socket.c:1564 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1564 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 13995: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xd1/0x110 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] __cache_free mm/slab.c:3445 [inline] kfree+0x10a/0x2c0 mm/slab.c:3803 sk_prot_free net/core/sock.c:1875 [inline] __sk_destruct+0x6a8/0x900 net/core/sock.c:1961 sk_destruct+0xbd/0xe0 net/core/sock.c:1976 __sk_free+0xef/0x3d0 net/core/sock.c:1987 sk_free+0x78/0xa0 net/core/sock.c:1998 sock_put include/net/sock.h:1848 [inline] l2cap_sock_kill+0x203/0x240 net/bluetooth/l2cap_sock.c:1227 l2cap_sock_release+0x184/0x200 net/bluetooth/l2cap_sock.c:1397 __sock_release+0xcd/0x280 net/socket.c:649 sock_close+0x18/0x20 net/socket.c:1314 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa7/0xd0 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1353 __queue_work+0x5ca/0xee0 kernel/workqueue.c:1519 queue_work_on+0xee/0x110 kernel/workqueue.c:1546 kref_put include/linux/kref.h:65 [inline] tty_kref_put drivers/tty/tty_io.c:1581 [inline] release_tty+0x4e9/0x610 drivers/tty/tty_io.c:1618 tty_release_struct+0xb4/0xe0 drivers/tty/tty_io.c:1717 tty_release+0xc70/0x1200 drivers/tty/tty_io.c:1878 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa7/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2987 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067 netlink_release+0xdd4/0x1dd0 net/netlink/af_netlink.c:815 __sock_release+0xcd/0x280 net/socket.c:649 sock_close+0x18/0x20 net/socket.c:1314 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xbae/0x2a30 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888012bd9000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 288 bytes inside of 2048-byte region [ffff888012bd9000, ffff888012bd9800) The buggy address belongs to the page: page:ffffea00004af640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12bd9 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00004b7ec8 ffffea00004af148 ffff888010c40800 raw: 0000000000000000 ffff888012bd9000 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 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 1, ts 2267341060, free_ts 2222951440 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x460 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3316 [inline] kmem_cache_alloc_trace+0x38c/0x480 mm/slab.c:3573 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] acpi_os_allocate_zeroed include/acpi/platform/aclinuxex.h:57 [inline] acpi_ds_create_walk_state+0x88/0x1ff drivers/acpi/acpica/dswstate.c:518 acpi_ps_execute_method+0x19d/0x61c drivers/acpi/acpica/psxface.c:134 acpi_ns_evaluate+0x6c7/0x966 drivers/acpi/acpica/nseval.c:205 acpi_evaluate_object+0x3db/0x7f5 drivers/acpi/acpica/nsxfeval.c:354 acpi_evaluate_integer+0xbf/0x1e0 drivers/acpi/utils.c:260 acpi_bus_get_status_handle drivers/acpi/bus.c:83 [inline] acpi_bus_get_status drivers/acpi/bus.c:112 [inline] acpi_bus_get_status+0x18c/0x370 drivers/acpi/bus.c:96 acpi_scan_init_status drivers/acpi/scan.c:1773 [inline] acpi_add_single_object+0x11c/0x1a10 drivers/acpi/scan.c:1806 acpi_bus_check_add+0x1ad/0x5d0 drivers/acpi/scan.c:2047 acpi_ns_walk_namespace+0x23d/0x41f drivers/acpi/acpica/nswalk.c:237 acpi_walk_namespace drivers/acpi/acpica/nsxfeval.c:606 [inline] acpi_walk_namespace+0xee/0x127 drivers/acpi/acpica/nsxfeval.c:554 acpi_bus_scan+0x171/0x1c0 drivers/acpi/scan.c:2360 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3394 slab_destroy mm/slab.c:1627 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1647 drain_cpu_caches mm/slab.c:2182 [inline] __kmem_cache_shrink+0xd3/0x180 mm/slab.c:2244 acpi_os_purge_cache+0x11/0x20 drivers/acpi/osl.c:1663 acpi_purge_cached_objects+0x37/0xd0 drivers/acpi/acpica/utxface.c:237 acpi_initialize_objects+0x2b/0x95 drivers/acpi/acpica/utxfinit.c:250 acpi_bus_init drivers/acpi/bus.c:1236 [inline] acpi_init+0x1cd/0x971 drivers/acpi/bus.c:1323 do_one_initcall+0x103/0x650 init/main.c:1303 do_initcall_level init/main.c:1376 [inline] do_initcalls init/main.c:1392 [inline] do_basic_setup init/main.c:1411 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1614 kernel_init+0x1a/0x1d0 init/main.c:1505 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888012bd9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888012bd9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888012bd9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888012bd9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888012bd9200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================