BUG: memory leak
unreferenced object 0xffff88811eeff4a0 (size 32):
  comm "syz-executor884", pid 7007, jiffies 4294945689 (age 7.770s)
  hex dump (first 32 bytes):
    70 70 70 30 00 70 70 70 00 00 00 00 00 00 00 00  ppp0.ppp........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000085c7914>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000085c7914>] slab_post_alloc_hook mm/slab.h:522 [inline]
    [<00000000085c7914>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000085c7914>] __do_kmalloc mm/slab.c:3653 [inline]
    [<00000000085c7914>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3670
    [<000000006913d6f8>] kstrdup+0x3a/0x70 mm/util.c:53
    [<000000001f498378>] kstrdup_const+0x48/0x60 mm/util.c:75
    [<00000000a4ef7688>] kvasprintf_const+0x7e/0xe0 lib/kasprintf.c:48
    [<0000000081470e61>] kobject_set_name_vargs+0x40/0xe0 lib/kobject.c:289
    [<0000000098a453d8>] dev_set_name+0x63/0x90 drivers/base/core.c:1918
    [<00000000bd6af661>] netdev_register_kobject+0x5a/0x1b0 net/core/net-sysfs.c:1727
    [<0000000026332814>] register_netdevice+0x397/0x600 net/core/dev.c:8723
    [<00000000a04050e7>] ppp_unit_register drivers/net/ppp/ppp_generic.c:989 [inline]
    [<00000000a04050e7>] ppp_dev_configure+0x2a8/0x380 drivers/net/ppp/ppp_generic.c:1045
    [<000000000d740f8b>] ppp_create_interface drivers/net/ppp/ppp_generic.c:3057 [inline]
    [<000000000d740f8b>] ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:844 [inline]
    [<000000000d740f8b>] ppp_ioctl+0x977/0xdd0 drivers/net/ppp/ppp_generic.c:597
    [<0000000069743d9f>] vfs_ioctl fs/ioctl.c:46 [inline]
    [<0000000069743d9f>] file_ioctl fs/ioctl.c:509 [inline]
    [<0000000069743d9f>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
    [<000000005bfce269>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
    [<00000000725fce7e>] __do_sys_ioctl fs/ioctl.c:720 [inline]
    [<00000000725fce7e>] __se_sys_ioctl fs/ioctl.c:718 [inline]
    [<00000000725fce7e>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
    [<00000000ef5d203e>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:296
    [<00000000c4ff9c42>] entry_SYSCALL_64_after_hwframe+0x44/0xa9