BUG: memory leak
unreferenced object 0xffff88810810aee0 (size 32):
  comm "syz-executor811", pid 7229, jiffies 4294943261 (age 8.010s)
  hex dump (first 32 bytes):
    73 69 74 31 00 74 61 73 6b 2f 37 32 32 39 00 00  sit1.task/7229..
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<0000000033bb4d0c>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<0000000033bb4d0c>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<0000000033bb4d0c>] slab_alloc mm/slab.c:3320 [inline]
    [<0000000033bb4d0c>] __do_kmalloc mm/slab.c:3654 [inline]
    [<0000000033bb4d0c>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3671
    [<00000000bfe4b455>] kstrdup+0x3a/0x70 mm/util.c:60
    [<000000001f9d8a80>] kstrdup_const+0x48/0x60 mm/util.c:82
    [<000000005d3db5e8>] kvasprintf_const+0x7e/0xe0 lib/kasprintf.c:48
    [<000000009b778aae>] kobject_set_name_vargs+0x40/0xe0 lib/kobject.c:289
    [<000000004096c8a3>] dev_set_name+0x63/0x90 drivers/base/core.c:2265
    [<0000000080d4b8f0>] netdev_register_kobject+0x5a/0x1b0 net/core/net-sysfs.c:1736
    [<00000000d2051cc5>] register_netdevice+0x1ce/0x650 net/core/dev.c:9316
    [<0000000057fe14e7>] ipip6_tunnel_create+0x7c/0xd0 net/ipv6/sit.c:208
    [<0000000087e8411f>] ipip6_newlink+0xb1/0x170 net/ipv6/sit.c:1589
    [<00000000f5d71b94>] __rtnl_newlink+0x89a/0xb80 net/core/rtnetlink.c:3305
    [<00000000f700db18>] rtnl_newlink+0x4e/0x80 net/core/rtnetlink.c:3363
    [<0000000060112dbf>] rtnetlink_rcv_msg+0x178/0x4b0 net/core/rtnetlink.c:5424
    [<00000000930cd6b9>] netlink_rcv_skb+0x61/0x170 net/netlink/af_netlink.c:2477
    [<00000000601b09c7>] rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5442
    [<00000000d8fb8eba>] netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
    [<00000000d8fb8eba>] netlink_unicast+0x223/0x310 net/netlink/af_netlink.c:1328