TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295 Read of size 8 at addr ffff888238b9f5d0 by task syz-executor.2/10857 CPU: 1 PID: 10857 Comm: syz-executor.2 Not tainted 4.19.190-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 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 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:00007fba4cf47218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056c010 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056c010 RBP: 000000000056c008 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c014 R13: 00007ffff1a907bf R14: 00007fba4cf47300 R15: 0000000000022000 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 11438: __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 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888238b9f1c0 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1040 bytes inside of 2048-byte region [ffff888238b9f1c0, ffff888238b9f9c0) The buggy address belongs to the page: page:ffffea0008e2e780 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0 flags: 0x57ff00000008100(slab|head) raw: 057ff00000008100 ffffea0008e2da88 ffffea0008e2eb88 ffff88813bff0c40 raw: 0000000000000000 ffff888238b9e0c0 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888238b9f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888238b9f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888238b9f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888238b9f600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888238b9f680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================