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BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x448/0x4b0 net/tipc/name_table.c:700
Read of size 4 at addr ffff8801c5975ad0 by task syz-executor5/28466

CPU: 1 PID: 28466 Comm: syz-executor5 Not tainted 4.14.0-rc4+ #82
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 print_address_description+0x73/0x250 mm/kasan/report.c:252
net_ratelimit: 4 callbacks suppressed
do_dccp_getsockopt: sockopt(PACKET_SIZE) is deprecated: fix your app
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 tipc_nametbl_lookup_dst_nodes+0x448/0x4b0 net/tipc/name_table.c:700
 tipc_sendmcast+0x794/0xe70 net/tipc/socket.c:791
do_dccp_getsockopt: sockopt(PACKET_SIZE) is deprecated: fix your app
 __tipc_sendmsg+0xebf/0x1b20 net/tipc/socket.c:1316
 tipc_sendmsg+0x50/0x70 net/tipc/socket.c:1250
 sock_sendmsg_nosec net/socket.c:633 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:643
 ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2049
 __sys_sendmsg+0xe5/0x210 net/socket.c:2083
 SYSC_sendmsg net/socket.c:2094 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2090
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452719
RSP: 002b:00007f05da20fbe8 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452719
RDX: 0000000000000000 RSI: 0000000020316000 RDI: 0000000000000013
RBP: 0000000000000039 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee5f8
R13: 00000000ffffffff R14: 00007f05da2106d4 R15: 0000000000000000

Allocated by task 28082:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3627
 kmalloc include/linux/slab.h:493 [inline]
 kmalloc_array include/linux/slab.h:611 [inline]
 kcalloc include/linux/slab.h:623 [inline]
 tipc_subseq_alloc net/tipc/name_table.c:142 [inline]
 tipc_nameseq_create+0xe8/0x540 net/tipc/name_table.c:153
 tipc_nametbl_insert_publ+0xf77/0x17c0 net/tipc/name_table.c:477
 tipc_nametbl_publish+0x2aa/0x4f0 net/tipc/name_table.c:762
 tipc_net_start+0x26f/0x450 net/tipc/net.c:120
 tipc_nl_net_set+0x4cf/0x770 net/tipc/net.c:245
 __tipc_nl_compat_doit net/tipc/netlink_compat.c:316 [inline]
 tipc_nl_compat_doit+0x431/0x660 net/tipc/netlink_compat.c:335
 tipc_nl_compat_handle net/tipc/netlink_compat.c:1158 [inline]
 tipc_nl_compat_recv+0xbe8/0x18f0 net/tipc/netlink_compat.c:1201
 genl_family_rcv_msg+0x7b7/0xfc0 net/netlink/genetlink.c:598
 genl_rcv_msg+0xb2/0x140 net/netlink/genetlink.c:623
 netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2401
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:634
 netlink_unicast_kernel net/netlink/af_netlink.c:1273 [inline]
 netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1299
 netlink_sendmsg+0xa4a/0xe70 net/netlink/af_netlink.c:1862
 sock_sendmsg_nosec net/socket.c:633 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:643
 sock_write_iter+0x320/0x5e0 net/socket.c:912
 call_write_iter include/linux/fs.h:1770 [inline]
 new_sync_write fs/read_write.c:468 [inline]
 __vfs_write+0x68a/0x970 fs/read_write.c:481
 vfs_write+0x18f/0x510 fs/read_write.c:543
 SYSC_write fs/read_write.c:588 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:580
 entry_SYSCALL_64_fastpath+0x1f/0xbe

Freed by task 25546:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xca/0x250 mm/slab.c:3820
 selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3806
 security_cred_free+0x48/0x80 security/security.c:994
 put_cred_rcu+0x106/0x400 kernel/cred.c:117
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2691 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2945 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2912 [inline]
 rcu_process_callbacks+0xd74/0x17b0 kernel/rcu/tree.c:2929
 __do_softirq+0x29d/0xbb2 kernel/softirq.c:284

The buggy address belongs to the object at ffff8801c5975ac0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8801c5975ac0, ffff8801c5975ae0)
The buggy address belongs to the page:
page:ffffea0007165d40 count:1 mapcount:0 mapping:ffff8801c5975000 index:0xffff8801c5975fc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801c5975000 ffff8801c5975fc1 000000010000003b
raw: ffffea000766ec60 ffffea00071c5960 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c5975980: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801c5975a00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801c5975a80: 00 00 00 fc fc fc fc fc 00 00 fc fc fc fc fc fc
                                                 ^
 ffff8801c5975b00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801c5975b80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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