BUG: memory leak
unreferenced object 0xffff888115012c20 (size 32):
  comm "syz-executor963", pid 7136, jiffies 4294944665 (age 8.090s)
  hex dump (first 32 bytes):
    67 72 65 74 61 70 31 00 6b 2f 37 31 33 36 00 00  gretap1.k/7136..
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<000000009ed1cbb7>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<000000009ed1cbb7>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<000000009ed1cbb7>] slab_alloc mm/slab.c:3320 [inline]
    [<000000009ed1cbb7>] __do_kmalloc mm/slab.c:3654 [inline]
    [<000000009ed1cbb7>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3671
    [<00000000a1a4bdfc>] kstrdup+0x3a/0x70 mm/util.c:60
    [<00000000936f2c08>] kstrdup_const+0x48/0x60 mm/util.c:82
    [<00000000c45dd445>] kvasprintf_const+0x7e/0xe0 lib/kasprintf.c:48
    [<00000000a7673865>] kobject_set_name_vargs+0x40/0xe0 lib/kobject.c:289
    [<00000000f89c2acc>] dev_set_name+0x63/0x90 drivers/base/core.c:2265
    [<00000000fba92843>] netdev_register_kobject+0x5a/0x1b0 net/core/net-sysfs.c:1733
    [<0000000093116df4>] register_netdevice+0x1ce/0x650 net/core/dev.c:9316
    [<0000000099cdc0fa>] ip_tunnel_newlink+0xda/0x220 net/ipv4/ip_tunnel.c:1141
    [<00000000cc4dcbde>] ipgre_newlink+0xa2/0xd0 net/ipv4/ip_gre.c:1299
    [<000000005d9a9797>] __rtnl_newlink+0x89a/0xb80 net/core/rtnetlink.c:3305
    [<000000004d6595a7>] rtnl_newlink+0x4e/0x80 net/core/rtnetlink.c:3363
    [<0000000017edc3f4>] rtnetlink_rcv_msg+0x178/0x4b0 net/core/rtnetlink.c:5424
    [<00000000a93a2460>] netlink_rcv_skb+0x61/0x170 net/netlink/af_netlink.c:2477
    [<0000000077eb974f>] rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5442
    [<00000000ceb84405>] netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
    [<00000000ceb84405>] netlink_unicast+0x223/0x310 net/netlink/af_netlink.c:1328