BUG: memory leak
unreferenced object 0xffff8881190ce260 (size 32):
  comm "syz-executor759", pid 7078, jiffies 4294948877 (age 8.030s)
  hex dump (first 32 bytes):
    69 70 36 67 72 65 74 61 70 30 00 30 37 38 00 ff  ip6gretap0.078..
    80 fa 95 04 00 ea ff ff c0 63 62 04 00 ea ff ff  .........cb.....
  backtrace:
    [<000000005cce0d1e>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<000000005cce0d1e>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<000000005cce0d1e>] slab_alloc mm/slab.c:3320 [inline]
    [<000000005cce0d1e>] __do_kmalloc mm/slab.c:3654 [inline]
    [<000000005cce0d1e>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3671
    [<000000001c4adad6>] kstrdup+0x3a/0x70 mm/util.c:60
    [<0000000099245d36>] kstrdup_const+0x48/0x60 mm/util.c:82
    [<000000004d65e06f>] kvasprintf_const+0x7e/0xe0 lib/kasprintf.c:48
    [<00000000e1c87c68>] kobject_set_name_vargs+0x40/0xe0 lib/kobject.c:289
    [<00000000c7ed6791>] dev_set_name+0x63/0x90 drivers/base/core.c:2265
    [<00000000b2654493>] netdev_register_kobject+0x5a/0x1b0 net/core/net-sysfs.c:1736
    [<00000000208ff45c>] register_netdevice+0x1ce/0x650 net/core/dev.c:9316
    [<000000001736bbc8>] ip6gre_newlink_common.isra.0+0x73/0x150 net/ipv6/ip6_gre.c:1959
    [<00000000007bfcd2>] ip6gre_newlink+0x8c/0x150 net/ipv6/ip6_gre.c:1992
    [<00000000e72976c8>] __rtnl_newlink+0x89a/0xb80 net/core/rtnetlink.c:3305
    [<000000007601f0cc>] rtnl_newlink+0x4e/0x80 net/core/rtnetlink.c:3363
    [<000000009d11de74>] rtnetlink_rcv_msg+0x178/0x4b0 net/core/rtnetlink.c:5424
    [<000000008fa9668f>] netlink_rcv_skb+0x61/0x170 net/netlink/af_netlink.c:2477
    [<000000003ee80be5>] rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5442
    [<0000000061841def>] netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
    [<0000000061841def>] netlink_unicast+0x223/0x310 net/netlink/af_netlink.c:1328