WARNING: can't dereference registers at 00000000000006f8 for ip entry_SYSCALL_64_after_hwframe+0x46/0xbb netlink: 14 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 14 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 14 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 14 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 14 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 14 bytes leftover after parsing attributes in process `syz-executor.2'. ================================================================== BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x4ad/0x4c0 net/tipc/name_table.c:670 Read of size 4 at addr ffff8880b5522b50 by task syz-executor.1/10107 CPU: 0 PID: 10107 Comm: syz-executor.1 Not tainted 4.14.212-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_load4_noabort+0x68/0x70 mm/kasan/report.c:429 tipc_nametbl_lookup_dst_nodes+0x4ad/0x4c0 net/tipc/name_table.c:670 tipc_sendmcast+0x51a/0xac0 net/tipc/socket.c:767 __tipc_sendmsg+0xbab/0xf90 net/tipc/socket.c:971 tipc_sendmsg+0x4c/0x70 net/tipc/socket.c:919 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 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+0x46/0xbb RIP: 0033:0x45e159 RSP: 002b:00007f59f00a4c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e159 RDX: 0000000000000000 RSI: 0000000020001800 RDI: 0000000000000004 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc265d6f2f R14: 00007f59f00a59c0 R15: 000000000119bf8c Allocated by task 8015: 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 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 mm/slab.c:3729 tipc_nameseq_create+0x53/0x290 net/tipc/name_table.c:152 tipc_nametbl_insert_publ+0xb37/0x14e0 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 tipc_create_listen_sock net/tipc/server.c:338 [inline] tipc_open_listening_sock net/tipc/server.c:396 [inline] tipc_server_start+0x31f/0x880 net/tipc/server.c:611 tipc_topsrv_start net/tipc/subscr.c:382 [inline] tipc_topsrv_init_net+0x53b/0x730 net/tipc/subscr.c:397 ops_init+0xaa/0x3e0 net/core/net_namespace.c:118 setup_net+0x22f/0x530 net/core/net_namespace.c:295 copy_net_ns+0x19b/0x440 net/core/net_namespace.c:419 create_new_namespaces+0x375/0x720 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xa1/0x1d0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2412 [inline] SyS_unshare+0x308/0x7f0 kernel/fork.c:2362 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 6269: 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 aa_free_task_context+0xda/0x130 security/apparmor/context.c:54 apparmor_cred_free+0x34/0x70 security/apparmor/lsm.c:58 security_cred_free+0x71/0xb0 security/security.c:1003 put_cred_rcu+0xe3/0x300 kernel/cred.c:117 __put_cred+0x1a1/0x210 kernel/cred.c:151 put_cred include/linux/cred.h:271 [inline] SYSC_faccessat fs/open.c:444 [inline] SyS_faccessat+0x52a/0x680 fs/open.c:353 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8880b5522b40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8880b5522b40, ffff8880b5522b60) The buggy address belongs to the page: page:ffffea0002d54880 count:1 mapcount:0 mapping:ffff8880b5522000 index:0xffff8880b5522fc1 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffff8880b5522000 ffff8880b5522fc1 0000000100000036 raw: ffffea0002c1d6e0 ffffea0002a778a0 ffff88813fe801c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880b5522a00: 00 01 fc fc fc fc fc fc 00 01 fc fc fc fc fc fc ffff8880b5522a80: 00 fc fc fc fc fc fc fc 00 fc fc fc fc fc fc fc >ffff8880b5522b00: 00 fc fc fc fc fc fc fc 00 00 fc fc fc fc fc fc ^ ffff8880b5522b80: 00 fc fc fc fc fc fc fc 00 fc fc fc fc fc fc fc ffff8880b5522c00: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc ==================================================================