================================================================== BUG: KASAN: use-after-free in tls_write_space+0x14b/0x170 net/tls/tls_main.c:239 Read of size 1 at addr ffff888054f1356a by task syz-executor.3/9546 CPU: 0 PID: 9546 Comm: syz-executor.3 Not tainted 5.2.0+ #97 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:612 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 tls_write_space+0x14b/0x170 net/tls/tls_main.c:239 tcp_new_space net/ipv4/tcp_input.c:5151 [inline] tcp_check_space+0x191/0x760 net/ipv4/tcp_input.c:5162 tcp_data_snd_check net/ipv4/tcp_input.c:5172 [inline] tcp_rcv_established+0x9c1/0x1e70 net/ipv4/tcp_input.c:5663 tcp_v6_do_rcv+0x41e/0x12c0 net/ipv6/tcp_ipv6.c:1356 sk_backlog_rcv include/net/sock.h:945 [inline] __release_sock+0x129/0x390 net/core/sock.c:2418 release_sock+0x59/0x1c0 net/core/sock.c:2934 tls_sk_proto_close+0x282/0x6b0 net/tls/tls_main.c:313 inet_release+0xed/0x200 net/ipv4/af_inet.c:427 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470 __sock_release+0xce/0x280 net/socket.c:590 sock_close+0x1e/0x30 net/socket.c:1268 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413511 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffff094a1c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413511 RDX: 0000001b2c220000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00000000aa362a87 R09: 00000000aa362a8b R10: 00007ffff094a2a0 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 0000000000761848 R15: ffffffffffffffff Allocated by task 9551: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:487 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:748 [inline] create_ctx+0x46/0x1f0 net/tls/tls_main.c:602 tls_init net/tls/tls_main.c:788 [inline] tls_init+0x11d/0x510 net/tls/tls_main.c:770 __tcp_set_ulp net/ipv4/tcp_ulp.c:126 [inline] tcp_set_ulp+0x330/0x640 net/ipv4/tcp_ulp.c:147 do_tcp_setsockopt.isra.0+0x363/0x24f0 net/ipv4/tcp.c:2808 tcp_setsockopt+0xbe/0xe0 net/ipv4/tcp.c:3135 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3130 __sys_setsockopt+0x261/0x4c0 net/socket.c:2084 __do_sys_setsockopt net/socket.c:2100 [inline] __se_sys_setsockopt net/socket.c:2097 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9546: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 tls_ctx_free.part.0+0x3a/0x40 net/tls/tls_main.c:261 tls_ctx_free net/tls/tls_main.c:256 [inline] tls_sk_proto_close+0x275/0x6b0 net/tls/tls_main.c:308 inet_release+0xed/0x200 net/ipv4/af_inet.c:427 inet6_release+0x53/0x80 net/ipv6/af_inet6.c:470 __sock_release+0xce/0x280 net/socket.c:590 sock_close+0x1e/0x30 net/socket.c:1268 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888054f13500 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 106 bytes inside of 512-byte region [ffff888054f13500, ffff888054f13700) The buggy address belongs to the page: page:ffffea000153c4c0 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0xffff888054f13a00 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00019e7648 ffffea00029e0308 ffff8880aa400a80 raw: ffff888054f13a00 ffff888054f13000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888054f13400: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888054f13480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888054f13500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888054f13580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888054f13600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================