tunl0: Master is either lo or non-ether device
netlink: 20 bytes leftover after parsing attributes in process `syz-executor020'.
gre0: Master is either lo or non-ether device
netlink: 20 bytes leftover after parsing attributes in process `syz-executor020'.
==================================================================
BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline]
BUG: KASAN: use-after-free in radix_tree_load_root lib/radix-tree.c:602 [inline]
BUG: KASAN: use-after-free in radix_tree_next_chunk+0x950/0x9a0 lib/radix-tree.c:1736
Read of size 8 at addr ffff88809742b648 by task syz-executor020/7461

CPU: 1 PID: 7461 Comm: syz-executor020 Not tainted 4.14.172-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
 __read_once_size include/linux/compiler.h:183 [inline]
 radix_tree_load_root lib/radix-tree.c:602 [inline]
 radix_tree_next_chunk+0x950/0x9a0 lib/radix-tree.c:1736
 radix_tree_iter_lookup include/linux/radix-tree.h:440 [inline]
 ida_remove+0x9b/0x210 lib/idr.c:377
 ida_simple_remove+0x31/0x50 lib/idr.c:503
 ipvlan_link_new+0x4f9/0xfc0 drivers/net/ipvlan/ipvlan_main.c:633
 rtnl_newlink+0xecb/0x1720 net/core/rtnetlink.c:2728
 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315
 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2432
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1877
 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: 0033:0x4416f9
RSP: 002b:00007ffc8c6e3d88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004416f9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 000000000000c469 R08: 0000000100000000 R09: 0000000100000000
R10: 0000000100000000 R11: 0000000000000246 R12: 00000000004025c0
R13: 0000000000402650 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 7461:
 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]
 kzalloc include/linux/slab.h:661 [inline]
 ipvlan_port_create drivers/net/ipvlan/ipvlan_main.c:140 [inline]
 ipvlan_link_new+0x640/0xfc0 drivers/net/ipvlan/ipvlan_main.c:562
 rtnl_newlink+0xecb/0x1720 net/core/rtnetlink.c:2728
 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315
 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2432
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1877
 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

Freed by task 7461:
 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
 ipvlan_uninit+0xb6/0xe0 drivers/net/ipvlan/ipvlan_main.c:233
 register_netdevice+0x756/0xc70 net/core/dev.c:7712
 ipvlan_link_new+0x485/0xfc0 drivers/net/ipvlan/ipvlan_main.c:611
 rtnl_newlink+0xecb/0x1720 net/core/rtnetlink.c:2728
 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315
 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2432
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1877
 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

The buggy address belongs to the object at ffff88809742ad80
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 2248 bytes inside of
 4096-byte region [ffff88809742ad80, ffff88809742bd80)
The buggy address belongs to the page:
page:ffffea00025d0a80 count:1 mapcount:0 mapping:ffff88809742ad80 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffff88809742ad80 0000000000000000 0000000100000001
raw: ffffea00025d0a20 ffff88812fe54a48 ffff88812fe56dc0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809742b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809742b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809742b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88809742b680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809742b700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================