================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295 Read of size 8 at addr ffff888238ae35d0 by task syz-executor880/8113 CPU: 1 PID: 8113 Comm: syz-executor880 Not tainted 4.19.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __raw_write_lock include/linux/rwlock_api_smp.h:210 [inline] _raw_write_lock+0x2a/0x40 kernel/locking/spinlock.c:288 nfc_llcp_sock_unlink+0x1d/0x190 net/nfc/llcp_core.c:44 llcp_sock_release+0x286/0x520 net/nfc/llcp_sock.c:652 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 kernel/exit.c:870 do_group_exit+0x125/0x310 kernel/exit.c:967 __do_sys_exit_group kernel/exit.c:978 [inline] __se_sys_exit_group kernel/exit.c:976 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x43db99 Code: Bad RIP value. RSP: 002b:00007ffe77888748 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043db99 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000400488 R10: 0000000000400488 R11: 0000000000000246 R12: 00000000004ae230 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 Allocated by task 1: kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] nfc_llcp_register_device+0x45/0x9b0 net/nfc/llcp_core.c:1584 nfc_register_device+0x6d/0x360 net/nfc/core.c:1129 nfcsim_device_new+0x333/0x5af drivers/nfc/nfcsim.c:417 nfcsim_init+0x71/0x14d drivers/nfc/nfcsim.c:464 do_one_initcall+0xf1/0x740 init/main.c:884 do_initcall_level init/main.c:952 [inline] do_initcalls init/main.c:960 [inline] do_basic_setup init/main.c:978 [inline] kernel_init_freeable+0x9a6/0xa98 init/main.c:1145 kernel_init+0xd/0x1b6 init/main.c:1062 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Freed by task 8113: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 local_release net/nfc/llcp_core.c:187 [inline] kref_put include/linux/kref.h:70 [inline] nfc_llcp_local_put+0x155/0x1b0 net/nfc/llcp_core.c:195 llcp_sock_destruct+0x7b/0x140 net/nfc/llcp_sock.c:959 __sk_destruct+0x4b/0x8a0 net/core/sock.c:1559 sk_destruct net/core/sock.c:1599 [inline] __sk_free+0x165/0x3b0 net/core/sock.c:1610 sk_free+0x3b/0x50 net/core/sock.c:1621 sock_put include/net/sock.h:1711 [inline] llcp_sock_release+0x37a/0x520 net/nfc/llcp_sock.c:656 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 kernel/exit.c:870 do_group_exit+0x125/0x310 kernel/exit.c:967 __do_sys_exit_group kernel/exit.c:978 [inline] __se_sys_exit_group kernel/exit.c:976 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888238ae31c0 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1040 bytes inside of 2048-byte region [ffff888238ae31c0, ffff888238ae39c0) The buggy address belongs to the page: page:ffffea0008e2b880 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0 flags: 0x57ff00000008100(slab|head) raw: 057ff00000008100 ffffea0008e29a88 ffffea0008e2c288 ffff88813bff0c40 raw: 0000000000000000 ffff888238ae20c0 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888238ae3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888238ae3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888238ae3580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888238ae3600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888238ae3680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================