================================================================== BUG: KASAN: use-after-free in tipc_nametbl_lookup_dst_nodes+0x4ad/0x4c0 net/tipc/name_table.c:670 Read of size 4 at addr ffff88808f6f3440 by task syz-executor.5/10885 CPU: 1 PID: 10885 Comm: syz-executor.5 Not tainted 4.14.180-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+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 tipc_nametbl_lookup_dst_nodes+0x4ad/0x4c0 net/tipc/name_table.c:670 tipc_sendmcast+0x599/0xb60 net/tipc/socket.c:767 __tipc_sendmsg+0xbc5/0xfd0 net/tipc/socket.c:971 tipc_sendmsg+0x4c/0x70 net/tipc/socket.c:919 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xc5/0x100 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c829 RSP: 002b:00007fe7f792ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000500e20 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000020000940 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a09 R14: 00000000004ccc1d R15: 00007fe7f792f6d4 Allocated by task 10885: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 kmem_cache_alloc_trace+0x14d/0x7b0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kmalloc_array include/linux/slab.h:606 [inline] kcalloc include/linux/slab.h:618 [inline] tipc_subseq_alloc net/tipc/name_table.c:141 [inline] tipc_nameseq_create+0x7e/0x2d0 net/tipc/name_table.c:152 tipc_nametbl_insert_publ+0x6b1/0x1450 net/tipc/name_table.c:476 tipc_nametbl_publish+0x211/0x3f0 net/tipc/name_table.c:701 tipc_sk_publish net/tipc/socket.c:2203 [inline] tipc_bind+0x2c4/0x600 net/tipc/socket.c:629 SYSC_bind+0x1a0/0x1e0 net/socket.c:1489 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 10882: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 tipc_nametbl_remove_publ+0x1e1/0x260 net/tipc/name_table.c:501 tipc_nametbl_withdraw+0x19b/0x4c0 net/tipc/name_table.c:727 tipc_sk_withdraw+0x30b/0x580 net/tipc/socket.c:2237 tipc_release+0xb1/0xcc0 net/tipc/socket.c:562 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x790 fs/file_table.c:210 task_work_run+0x113/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1d6/0x220 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+0x42/0xb7 The buggy address belongs to the object at ffff88808f6f3440 which belongs to the cache kmalloc-32 of size 32 cannot load conntrack support for proto=10 The buggy address is located 0 bytes inside of 32-byte region [ffff88808f6f3440, ffff88808f6f3460) The buggy address belongs to the page: page:ffffea00023dbcc0 count:1 mapcount:0 mapping:ffff88808f6f3000 index:0xffff88808f6f3fc1 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88808f6f3000 ffff88808f6f3fc1 000000010000003f raw: ffffea00029f71e0 ffffea000234ac60 ffff88812fe541c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808f6f3300: 00 00 01 fc fc fc fc fc 00 fc fc fc fc fc fc fc ffff88808f6f3380: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc >ffff88808f6f3400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff88808f6f3480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff88808f6f3500: 00 00 01 fc fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================