audit: type=1400 audit(1589488676.059:8): avc:  denied  { execmem } for  pid=6345 comm="syz-executor905" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
==================================================================
BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x44c/0x4c0 net/tipc/name_table.c:670
Read of size 4 at addr ffff888098ba2590 by task syz-executor905/6345

CPU: 1 PID: 6345 Comm: syz-executor905 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+0x44c/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: 0033:0x440289
RSP: 002b:00007ffeef8b5d48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440289
RDX: 0000000000000000 RSI: 0000000020000940 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401b10
R13: 0000000000401ba0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 6345:
 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 4589:
 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
 security_cred_free+0x71/0xb0 security/security.c:1003
 put_cred_rcu+0xe3/0x300 kernel/cred.c:117
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2699 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
 rcu_process_callbacks+0x792/0x1190 kernel/rcu/tree.c:2946
 __do_softirq+0x254/0x9bf kernel/softirq.c:288

The buggy address belongs to the object at ffff888098ba2580
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff888098ba2580, ffff888098ba25a0)
The buggy address belongs to the page:
page:ffffea000262e880 count:1 mapcount:0 mapping:ffff888098ba2000 index:0xffff888098ba2fc1
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff888098ba2000 ffff888098ba2fc1 0000000100000031
raw: ffffea00023c91a0 ffffea000262e960 ffff88812fe541c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888098ba2480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff888098ba2500: 00 00 01 fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff888098ba2580: 00 00 fc fc fc fc fc fc 00 01 fc fc fc fc fc fc
                         ^
 ffff888098ba2600: 00 00 fc fc fc fc fc fc 00 00 01 fc fc fc fc fc
 ffff888098ba2680: 00 00 01 fc fc fc fc fc 00 00 00 fc fc fc fc fc
==================================================================