BUG: memory leak
unreferenced object 0xffff888122e1e8a0 (size 32):
  comm "syz-executor039", pid 6993, jiffies 4294947287 (age 7.800s)
  hex dump (first 32 bytes):
    69 70 36 74 6e 6c 31 00 6b 2f 36 39 39 33 00 00  ip6tnl1.k/6993..
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<000000005efd24c5>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<000000005efd24c5>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<000000005efd24c5>] slab_alloc mm/slab.c:3319 [inline]
    [<000000005efd24c5>] __do_kmalloc mm/slab.c:3653 [inline]
    [<000000005efd24c5>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3670
    [<000000001a04f09b>] kstrdup+0x3a/0x70 mm/util.c:60
    [<00000000bfd41d8c>] kstrdup_const+0x48/0x60 mm/util.c:82
    [<00000000b95c7349>] kvasprintf_const+0x7e/0xe0 lib/kasprintf.c:48
    [<000000005a8863a8>] kobject_set_name_vargs+0x40/0xe0 lib/kobject.c:289
    [<00000000058d655a>] dev_set_name+0x63/0x90 drivers/base/core.c:2006
    [<000000004194b55f>] netdev_register_kobject+0x5a/0x1b0 net/core/net-sysfs.c:1727
    [<00000000d8aa7826>] register_netdevice+0x397/0x610 net/core/dev.c:9086
    [<00000000d5590b6f>] ip6_tnl_create2+0x47/0x90 net/ipv6/ip6_tunnel.c:264
    [<00000000d3a72be1>] ip6_tnl_create net/ipv6/ip6_tunnel.c:315 [inline]
    [<00000000d3a72be1>] ip6_tnl_locate net/ipv6/ip6_tunnel.c:363 [inline]
    [<00000000d3a72be1>] ip6_tnl_locate+0x1f2/0x2e0 net/ipv6/ip6_tunnel.c:341
    [<00000000242ce9fb>] ip6_tnl_ioctl+0x198/0x3d0 net/ipv6/ip6_tunnel.c:1627
    [<00000000c5e5bdb9>] dev_ifsioc+0x324/0x460 net/core/dev_ioctl.c:322
    [<00000000207b9c10>] dev_ioctl+0x157/0x470 net/core/dev_ioctl.c:514
    [<000000009db80423>] sock_ioctl+0x394/0x480 net/socket.c:1103
    [<00000000966c79e6>] vfs_ioctl fs/ioctl.c:46 [inline]
    [<00000000966c79e6>] file_ioctl fs/ioctl.c:509 [inline]
    [<00000000966c79e6>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
    [<0000000041409f1d>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713