RBP: 0000000000017000 R08: 0000000020000248 R09: 0000000000000000 R10: fe03f80fe03f80ff R11: 0000000000000246 R12: 0000000000000003 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000040 ================================================================== BUG: KASAN: use-after-free in tls_write_space+0x238/0x2d0 net/tls/tls_main.c:222 Read of size 1 at addr ffff8880a4265b70 by task syz-executor.1/15746 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. CPU: 1 PID: 15746 Comm: syz-executor.1 Not tainted 4.14.198-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+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load1_noabort+0x68/0x70 mm/kasan/report.c:427 tls_write_space+0x238/0x2d0 net/tls/tls_main.c:222 tcp_new_space net/ipv4/tcp_input.c:5112 [inline] tcp_check_space+0x395/0x640 net/ipv4/tcp_input.c:5123 tcp_data_snd_check net/ipv4/tcp_input.c:5133 [inline] tcp_rcv_established+0x727/0x17a0 net/ipv4/tcp_input.c:5579 tcp_v6_do_rcv+0xc60/0x1190 net/ipv6/tcp_ipv6.c:1301 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. sk_backlog_rcv include/net/sock.h:921 [inline] __release_sock+0x12a/0x350 net/core/sock.c:2269 release_sock+0x54/0x1b0 net/core/sock.c:2805 tls_sk_proto_close+0x575/0x8b0 net/tls/tls_main.c:294 inet_release+0xdf/0x1b0 net/ipv4/af_inet.c:425 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:450 __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 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. 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: 0033:0x4177b1 RSP: 002b:00007ffdce382700 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004177b1 RDX: 0000000000000000 RSI: 000000000000086e RDI: 0000000000000004 RBP: 0000000000000001 R08: 00000000216a486e R09: 00000000216a4872 R10: 00007ffdce3827e0 R11: 0000000000000293 R12: 000000000118c9a0 R13: 000000000118c9a0 R14: 00000000000003e8 R15: 000000000118bf2c Allocated by task 15752: 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] tls_init+0xb1/0x4e0 net/tls/tls_main.c:518 tcp_set_ulp+0x18f/0x4b6 net/ipv4/tcp_ulp.c:127 do_tcp_setsockopt.constprop.0+0x1f6/0x1c10 net/ipv4/tcp.c:2547 tcp_setsockopt net/ipv4/tcp.c:2830 [inline] tcp_setsockopt+0xa7/0xc0 net/ipv4/tcp.c:2822 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 15746: 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 tls_ctx_free net/tls/tls_main.c:252 [inline] tls_ctx_free net/tls/tls_main.c:246 [inline] tls_sk_proto_close+0x568/0x8b0 net/tls/tls_main.c:290 inet_release+0xdf/0x1b0 net/ipv4/af_inet.c:425 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:450 __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 ffff8880a4265b00 which belongs to the cache kmalloc-192 of size 192 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. The buggy address is located 112 bytes inside of 192-byte region [ffff8880a4265b00, ffff8880a4265bc0) The buggy address belongs to the page: page:ffffea0002909940 count:1 mapcount:0 mapping:ffff8880a4265000 index:0xffff8880a4265700 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff8880a4265000 ffff8880a4265700 000000010000000b raw: ffffea00020f8820 ffffea000293f760 ffff88812fe50040 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a4265a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a4265a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880a4265b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a4265b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a4265c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================