================================================================== BUG: KASAN: use-after-free in trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline] BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x3f3/0x510 include/trace/events/lock.h:13 Read of size 8 at addr ffff8882386b90f8 by task syz-executor.2/26881 CPU: 0 PID: 26881 Comm: syz-executor.2 Not tainted 4.14.232-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline] perf_trace_lock_acquire+0x3f3/0x510 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x2b8/0x3f0 kernel/locking/lockdep.c:3997 __raw_write_lock include/linux/rwlock_api_smp.h:210 [inline] _raw_write_lock+0x2a/0x40 kernel/locking/spinlock.c:296 nfc_llcp_sock_unlink+0x1d/0x170 net/nfc/llcp_core.c:44 llcp_sock_release+0x235/0x4c0 net/nfc/llcp_sock.c:653 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4193eb RSP: 002b:00007ffee01f0bd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00000000004193eb RDX: 00000000005733c0 RSI: 00007f8336d92588 RDI: 0000000000000006 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b3232da2c R10: 00007ffee01f0cc0 R11: 0000000000000293 R12: 0000000000086c6b R13: 00000000000003e8 R14: 000000000056bf60 R15: 0000000000086c1d Allocated by task 1: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] nfc_llcp_register_device+0x43/0xa50 net/nfc/llcp_core.c:1584 nfc_register_device+0x63/0x330 net/nfc/core.c:1132 nfcsim_device_new+0x372/0x5c2 drivers/nfc/nfcsim.c:417 nfcsim_init+0x71/0x12a drivers/nfc/nfcsim.c:464 do_one_initcall+0x88/0x210 init/main.c:826 do_initcall_level init/main.c:892 [inline] do_initcalls init/main.c:900 [inline] do_basic_setup init/main.c:918 [inline] kernel_init_freeable+0x553/0x614 init/main.c:1075 kernel_init+0xd/0x165 init/main.c:1000 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Freed by task 26879: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 local_release net/nfc/llcp_core.c:187 [inline] kref_put include/linux/kref.h:70 [inline] nfc_llcp_local_put+0x13c/0x190 net/nfc/llcp_core.c:195 llcp_sock_destruct+0x69/0x120 net/nfc/llcp_sock.c:960 __sk_destruct+0x49/0x760 net/core/sock.c:1557 sk_destruct net/core/sock.c:1597 [inline] __sk_free+0xd9/0x2d0 net/core/sock.c:1605 sk_free+0x2b/0x40 net/core/sock.c:1616 sock_put include/net/sock.h:1662 [inline] llcp_sock_release+0x31b/0x4c0 net/nfc/llcp_sock.c:657 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8882386b8cc0 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1080 bytes inside of 2048-byte region [ffff8882386b8cc0, ffff8882386b94c0) The buggy address belongs to the page: page:ffffea0008e1ae00 count:1 mapcount:0 mapping:ffff8882386b8440 index:0x0 compound_mapcount: 0 flags: 0x57ff00000008100(slab|head) raw: 057ff00000008100 ffff8882386b8440 0000000000000000 0000000100000003 raw: ffffea0008e19220 ffffea0008e1afa0 ffff88813fe80c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8882386b8f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8882386b9000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8882386b9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8882386b9100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8882386b9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================