================================================================== BUG: KASAN: use-after-free in tls_write_space+0x150/0x170 net/tls/tls_main.c:239 Read of size 1 at addr ffff8880619618f8 by task syz-executor.3/15072 CPU: 1 PID: 15072 Comm: syz-executor.3 Not tainted 5.2.0-rc5+ #57 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+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 tls_write_space+0x150/0x170 net/tls/tls_main.c:239 tcp_new_space net/ipv4/tcp_input.c:5147 [inline] tcp_check_space+0x430/0x720 net/ipv4/tcp_input.c:5158 tcp_data_snd_check net/ipv4/tcp_input.c:5168 [inline] tcp_rcv_established+0x98f/0x1fa0 net/ipv4/tcp_input.c:5659 tcp_v4_do_rcv+0x610/0x8c0 net/ipv4/tcp_ipv4.c:1536 sk_backlog_rcv include/net/sock.h:945 [inline] __release_sock+0x129/0x390 net/core/sock.c:2417 release_sock+0x59/0x1c0 net/core/sock.c:2933 tls_sk_proto_close+0x40b/0x770 net/tls/tls_main.c:312 inet_release+0xe0/0x1f0 net/ipv4/af_inet.c:427 __sock_release+0x1f4/0x2a0 net/socket.c:601 sock_release+0x18/0x20 net/socket.c:621 smc_clcsock_release+0xb8/0xe0 net/smc/smc_close.c:35 smc_release+0x4e4/0x7b0 net/smc/af_smc.c:170 __sock_release+0xce/0x2a0 net/socket.c:601 sock_close+0x1b/0x30 net/socket.c:1273 __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 get_signal+0x201b/0x24b0 kernel/signal.c:2434 do_signal+0x87/0x1900 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x244/0x2c0 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:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd7ac668c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 0000000000004000 RBX: 00007fd7ac668c90 RCX: 00000000004592c9 RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd7ac6696d4 R13: 00000000004c91cc R14: 00000000004e0178 R15: 0000000000000004 Allocated by task 15072: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 kmem_cache_alloc_trace+0x151/0x750 mm/slab.c:3555 kmalloc include/linux/slab.h:547 [inline] kzalloc include/linux/slab.h:742 [inline] create_ctx+0x46/0x1f0 net/tls/tls_main.c:601 tls_init net/tls/tls_main.c:787 [inline] tls_init+0x11d/0x510 net/tls/tls_main.c:769 __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+0x321/0x2310 net/ipv4/tcp.c:2789 tcp_setsockopt+0xbe/0xe0 net/ipv4/tcp.c:3103 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3129 __sys_setsockopt+0x17a/0x280 net/socket.c:2072 __do_sys_setsockopt net/socket.c:2083 [inline] __se_sys_setsockopt net/socket.c:2080 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2080 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 15072: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kfree+0xcf/0x220 mm/slab.c:3755 tls_ctx_free.part.0+0x34/0x40 net/tls/tls_main.c:261 tls_ctx_free net/tls/tls_main.c:256 [inline] tls_sk_proto_close+0x3fe/0x770 net/tls/tls_main.c:307 inet_release+0xe0/0x1f0 net/ipv4/af_inet.c:427 __sock_release+0x1f4/0x2a0 net/socket.c:601 sock_release+0x18/0x20 net/socket.c:621 smc_clcsock_release+0xb8/0xe0 net/smc/smc_close.c:35 smc_release+0x4e4/0x7b0 net/smc/af_smc.c:170 __sock_release+0xce/0x2a0 net/socket.c:601 sock_close+0x1b/0x30 net/socket.c:1273 __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 get_signal+0x201b/0x24b0 kernel/signal.c:2434 do_signal+0x87/0x1900 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x244/0x2c0 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:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888061961800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 248 bytes inside of 512-byte region [ffff888061961800, ffff888061961a00) The buggy address belongs to the page: page:ffffea0001865840 refcount:1 mapcount:0 mapping:ffff8880aa400940 index:0xffff888061961d00 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00021b0908 ffffea0002909e88 ffff8880aa400940 raw: ffff888061961d00 ffff888061961080 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888061961780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888061961800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888061961880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888061961900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888061961980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================