================================================================== BUG: KASAN: slab-out-of-bounds in trace_event_get_offsets_lock_acquire syzkaller/managers/linux-4-19/kernel/./include/trace/events/lock.h:13 [inline] BUG: KASAN: slab-out-of-bounds in perf_trace_lock_acquire+0x402/0x530 syzkaller/managers/linux-4-19/kernel/./include/trace/events/lock.h:13 Read of size 8 at addr ffff88804b366578 by task syz-executor.1/6694 CPU: 0 PID: 6694 Comm: syz-executor.1 Not tainted 4.19.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:354 kasan_report syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:433 trace_event_get_offsets_lock_acquire syzkaller/managers/linux-4-19/kernel/./include/trace/events/lock.h:13 [inline] perf_trace_lock_acquire+0x402/0x530 syzkaller/managers/linux-4-19/kernel/./include/trace/events/lock.h:13 trace_lock_acquire syzkaller/managers/linux-4-19/kernel/./include/trace/events/lock.h:13 [inline] lock_acquire+0x298/0x3c0 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:3906 __raw_spin_lock_bh syzkaller/managers/linux-4-19/kernel/./include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 syzkaller/managers/linux-4-19/kernel/kernel/locking/spinlock.c:168 spin_lock_bh syzkaller/managers/linux-4-19/kernel/./include/linux/spinlock.h:334 [inline] lock_sock_nested+0x3b/0x110 syzkaller/managers/linux-4-19/kernel/net/core/sock.c:2864 l2cap_sock_teardown_cb+0xa0/0x6d0 syzkaller/managers/linux-4-19/kernel/net/bluetooth/l2cap_sock.c:1340 l2cap_chan_del+0xbc/0xa50 syzkaller/managers/linux-4-19/kernel/net/bluetooth/l2cap_core.c:599 l2cap_conn_del+0x3a6/0x6e0 syzkaller/managers/linux-4-19/kernel/net/bluetooth/l2cap_core.c:1729 l2cap_disconn_cfm syzkaller/managers/linux-4-19/kernel/net/bluetooth/l2cap_core.c:7441 [inline] l2cap_disconn_cfm+0x98/0xd0 syzkaller/managers/linux-4-19/kernel/net/bluetooth/l2cap_core.c:7434 hci_disconn_cfm syzkaller/managers/linux-4-19/kernel/./include/net/bluetooth/hci_core.h:1261 [inline] hci_conn_hash_flush+0x127/0x260 syzkaller/managers/linux-4-19/kernel/net/bluetooth/hci_conn.c:1512 hci_dev_do_close+0x659/0xf10 syzkaller/managers/linux-4-19/kernel/net/bluetooth/hci_core.c:1666 hci_rfkill_set_block+0xe7/0x160 syzkaller/managers/linux-4-19/kernel/net/bluetooth/hci_core.c:2100 rfkill_set_block+0x1f9/0x540 syzkaller/managers/linux-4-19/kernel/net/rfkill/core.c:353 rfkill_fop_write+0x250/0x4a0 syzkaller/managers/linux-4-19/kernel/net/rfkill/core.c:1249 __vfs_write+0xf7/0x770 syzkaller/managers/linux-4-19/kernel/fs/read_write.c:485 vfs_write+0x1f3/0x540 syzkaller/managers/linux-4-19/kernel/fs/read_write.c:549 ksys_write+0x12b/0x2a0 syzkaller/managers/linux-4-19/kernel/fs/read_write.c:599 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465d99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f29f0efa188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465d99 RDX: 0000000000000008 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000004bcf27 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffeedaabb2f R14: 00007f29f0efa300 R15: 0000000000022000 Allocated by task 5485: kmem_cache_alloc_trace+0x12f/0x380 syzkaller/managers/linux-4-19/kernel/mm/slab.c:3625 kmalloc syzkaller/managers/linux-4-19/kernel/./include/linux/slab.h:515 [inline] kzalloc syzkaller/managers/linux-4-19/kernel/./include/linux/slab.h:709 [inline] kobject_uevent_env+0x236/0x14a0 syzkaller/managers/linux-4-19/kernel/lib/kobject_uevent.c:521 kobject_cleanup syzkaller/managers/linux-4-19/kernel/lib/kobject.c:649 [inline] kobject_release syzkaller/managers/linux-4-19/kernel/lib/kobject.c:691 [inline] kref_put syzkaller/managers/linux-4-19/kernel/./include/linux/kref.h:70 [inline] kobject_put+0x38c/0x5d0 syzkaller/managers/linux-4-19/kernel/lib/kobject.c:708 net_rx_queue_update_kobjects+0x347/0x450 syzkaller/managers/linux-4-19/kernel/net/core/net-sysfs.c:984 remove_queue_kobjects syzkaller/managers/linux-4-19/kernel/net/core/net-sysfs.c:1617 [inline] netdev_unregister_kobject+0x14d/0x1e0 syzkaller/managers/linux-4-19/kernel/net/core/net-sysfs.c:1768 rollback_registered_many+0x661/0xe70 syzkaller/managers/linux-4-19/kernel/net/core/dev.c:8212 rollback_registered+0xe9/0x1b0 syzkaller/managers/linux-4-19/kernel/net/core/dev.c:8230 unregister_netdevice_queue+0x1de/0x3e0 syzkaller/managers/linux-4-19/kernel/net/core/dev.c:9297 unregister_netdevice syzkaller/managers/linux-4-19/kernel/./include/linux/netdevice.h:2614 [inline] __tun_detach+0x100d/0x1320 syzkaller/managers/linux-4-19/kernel/drivers/net/tun.c:737 tun_detach syzkaller/managers/linux-4-19/kernel/drivers/net/tun.c:754 [inline] tun_chr_close+0xd9/0x180 syzkaller/managers/linux-4-19/kernel/drivers/net/tun.c:3275 __fput+0x2ce/0x890 syzkaller/managers/linux-4-19/kernel/fs/file_table.c:278 task_work_run+0x148/0x1c0 syzkaller/managers/linux-4-19/kernel/kernel/task_work.c:113 tracehook_notify_resume syzkaller/managers/linux-4-19/kernel/./include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:167 prepare_exit_to_usermode syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:198 [inline] syscall_return_slowpath syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5528: __cache_free syzkaller/managers/linux-4-19/kernel/mm/slab.c:3503 [inline] kfree+0xcc/0x210 syzkaller/managers/linux-4-19/kernel/mm/slab.c:3822 call_usermodehelper_freeinfo syzkaller/managers/linux-4-19/kernel/kernel/umh.c:45 [inline] umh_complete+0x74/0x90 syzkaller/managers/linux-4-19/kernel/kernel/umh.c:60 call_usermodehelper_exec_async+0x5a0/0x6a0 syzkaller/managers/linux-4-19/kernel/kernel/umh.c:126 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff88804b366680 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 264 bytes to the left of 4096-byte region [ffff88804b366680, ffff88804b367680) The buggy address belongs to the page: page:ffffea00012cd980 count:1 mapcount:0 mapping:ffff88813bff0dc0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffffea0002688308 ffffea00013cb288 ffff88813bff0dc0 raw: 0000000000000000 ffff88804b366680 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804b366400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804b366480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804b366500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88804b366580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804b366600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================