netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'.
==================================================================
BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
Read of size 8 at addr ffff888235a0b210 by task syz-executor.5/6739

CPU: 0 PID: 6739 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 __lock_acquire+0x2cb4/0x3ff0 kernel/locking/lockdep.c:3295
 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
 __mutex_lock_common kernel/locking/mutex.c:937 [inline]
 __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078
 xt_find_match net/netfilter/x_tables.c:189 [inline]
 xt_find_match+0xa3/0x280 net/netfilter/x_tables.c:181
 xt_request_find_match net/netfilter/x_tables.c:219 [inline]
 xt_request_find_match+0x88/0x110 net/netfilter/x_tables.c:212
 get_xt_match net/sched/em_ipt.c:112 [inline]
 em_ipt_change+0x1c7/0x470 net/sched/em_ipt.c:132
 tcf_em_validate net/sched/ematch.c:248 [inline]
 tcf_em_tree_validate net/sched/ematch.c:365 [inline]
 tcf_em_tree_validate+0x8fa/0xea0 net/sched/ematch.c:307
 basic_set_parms net/sched/cls_basic.c:155 [inline]
 basic_change+0x1173/0x1260 net/sched/cls_basic.c:212
 tc_new_tfilter+0xb52/0x16c0 net/sched/cls_api.c:1320
 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4782
 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463
 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline]
 netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351
 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:661
 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227
 __sys_sendmsg net/socket.c:2265 [inline]
 __do_sys_sendmsg net/socket.c:2274 [inline]
 __se_sys_sendmsg net/socket.c:2272 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f98998190f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9897d8b168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f9899938f80 RCX: 00007f98998190f9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000004
RBP: 00007f9899874ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd79daa76f R14: 00007f9897d8b300 R15: 0000000000022000

Allocated by task 1:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 __register_sysctl_table+0x112/0x1090 fs/proc/proc_sysctl.c:1310
 neigh_sysctl_register+0x341/0x680 net/core/neighbour.c:3260
 devinet_sysctl_register+0xb1/0x230 net/ipv4/devinet.c:2381
 inetdev_init+0x223/0x4a0 net/ipv4/devinet.c:269
 inetdev_event+0x9cf/0x1270 net/ipv4/devinet.c:1477
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
 call_netdevice_notifiers net/core/dev.c:1762 [inline]
 register_netdevice+0xdd2/0x10f0 net/core/dev.c:8761
 __ip_tunnel_create+0x398/0x580 net/ipv4/ip_tunnel.c:280
 ip_tunnel_init_net+0x330/0x990 net/ipv4/ip_tunnel.c:1035
 ops_init+0xb3/0x410 net/core/net_namespace.c:129
 __register_pernet_operations net/core/net_namespace.c:957 [inline]
 register_pernet_operations+0x32f/0x790 net/core/net_namespace.c:1028
 register_pernet_device+0x26/0x70 net/core/net_namespace.c:1115
 ipgre_init+0x45/0x19f net/ipv4/ip_gre.c:1780
 do_one_initcall+0xf1/0x740 init/main.c:884
 do_initcall_level init/main.c:952 [inline]
 do_initcalls init/main.c:960 [inline]
 do_basic_setup init/main.c:978 [inline]
 kernel_init_freeable+0x9c5/0xab7 init/main.c:1145
 kernel_init+0xd/0x1ba init/main.c:1062
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff888235a0adc0
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 80 bytes to the right of
 1024-byte region [ffff888235a0adc0, ffff888235a0b1c0)
The buggy address belongs to the page:
page:ffffea0008d68280 count:1 mapcount:0 mapping:ffff88813bff0ac0 index:0xffff888235a0b240 compound_mapcount: 0
flags: 0x57ff00000008100(slab|head)
raw: 057ff00000008100 ffffea0008d69d88 ffffea0008e37988 ffff88813bff0ac0
raw: ffff888235a0b240 ffff888235a0a040 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888235a0b100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888235a0b180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888235a0b200: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                         ^
 ffff888235a0b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888235a0b300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================