BUG: memory leak
unreferenced object 0xffff88810d6f0500 (size 128):
  comm "syz-executor.4", pid 7492, jiffies 4295042541 (age 9.330s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000b296bda5>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000b296bda5>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<00000000b296bda5>] slab_alloc mm/slab.c:3319 [inline]
    [<00000000b296bda5>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<00000000f6731630>] kmalloc include/linux/slab.h:556 [inline]
    [<00000000f6731630>] kzalloc include/linux/slab.h:690 [inline]
    [<00000000f6731630>] cfserl_create+0x24/0x76 net/caif/cfserl.c:36
    [<000000004104a20e>] caif_device_notify+0x347/0x3bc net/caif/caif_dev.c:388
    [<000000007bd4e661>] notifier_call_chain+0x66/0xb0 kernel/notifier.c:95
    [<00000000eb0a9aa7>] __raw_notifier_call_chain kernel/notifier.c:396 [inline]
    [<00000000eb0a9aa7>] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:403
    [<00000000d907b510>] call_netdevice_notifiers_info+0x33/0x70 net/core/dev.c:1749
    [<00000000e6143c5b>] call_netdevice_notifiers_extack net/core/dev.c:1761 [inline]
    [<00000000e6143c5b>] call_netdevice_notifiers net/core/dev.c:1775 [inline]
    [<00000000e6143c5b>] register_netdevice+0x445/0x610 net/core/dev.c:8810
    [<000000002e8b1d4c>] ldisc_open+0x1de/0x330 drivers/net/caif/caif_serial.c:353
    [<0000000010d46f18>] tty_ldisc_open.isra.0+0x40/0x70 drivers/tty/tty_ldisc.c:469
    [<00000000564f8953>] tty_set_ldisc+0x149/0x240 drivers/tty/tty_ldisc.c:596
    [<0000000084aa0a5f>] tiocsetd drivers/tty/tty_io.c:2334 [inline]
    [<0000000084aa0a5f>] tty_ioctl+0x366/0xa30 drivers/tty/tty_io.c:2594
    [<000000001cdd8e3b>] vfs_ioctl fs/ioctl.c:46 [inline]
    [<000000001cdd8e3b>] file_ioctl fs/ioctl.c:509 [inline]
    [<000000001cdd8e3b>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
    [<0000000026591843>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
    [<00000000941bc571>] __do_sys_ioctl fs/ioctl.c:720 [inline]
    [<00000000941bc571>] __se_sys_ioctl fs/ioctl.c:718 [inline]
    [<00000000941bc571>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
    [<000000008438930c>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<00000000ddd83c5c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9