RDX: 00000000fffffdef RSI: 00000000200005c0 RDI: 0000000000000004 RBP: 0000000000000005 R08: 0000000020000000 R09: 000000000000001c R10: 0000000000000040 R11: 0000000000000212 R12: 0000000000000000 R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 ================================================================== BUG: KASAN: use-after-free in tls_fill_prepend include/net/tls.h:339 [inline] BUG: KASAN: use-after-free in tls_push_record+0x1091/0x1400 net/tls/tls_sw.c:239 Write of size 1 at addr ffff8801a99a8000 by task syz-executor187/6277 CPU: 1 PID: 6277 Comm: syz-executor187 Not tainted 4.18.0-rc8+ #182 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_store1_noabort+0x17/0x20 mm/kasan/report.c:435 tls_fill_prepend include/net/tls.h:339 [inline] tls_push_record+0x1091/0x1400 net/tls/tls_sw.c:239 tls_sw_push_pending_record+0x22/0x30 net/tls/tls_sw.c:276 tls_handle_open_record net/tls/tls_main.c:164 [inline] tls_sk_proto_close+0x74c/0xae0 net/tls/tls_main.c:264 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:459 __sock_release+0xd7/0x260 net/socket.c:600 sock_close+0x19/0x20 net/socket.c:1151 __fput+0x355/0x8b0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x401980 Code: 01 f0 ff ff 0f 83 d0 0a 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d ad 2e 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 a4 0a 00 00 c3 48 83 ec 08 e8 5a 01 00 00 RSP: 002b:00007ffd99e9f598 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000401980 RDX: 00000000fffffdef RSI: 00000000200005c0 RDI: 0000000000000004 RBP: 0000000000000005 R08: 0000000020000000 R09: 000000000000001c R10: 0000000000000040 R11: 0000000000000246 R12: 0000000000000000 R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea0006a66a00 count:0 mapcount:-128 mapping:0000000000000000 index:0x0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 ffffea000728a808 ffffea00071eb408 0000000000000000 raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a99a7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801a99a7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801a99a8000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8801a99a8080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8801a99a8100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================