BUG: memory leak
unreferenced object 0xffff8881198c0980 (size 128):
  comm "syz-executor.5", pid 7903, jiffies 4294953156 (age 9.570s)
  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:
    [<0000000028ca34c4>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<0000000028ca34c4>] slab_post_alloc_hook mm/slab.h:586 [inline]
    [<0000000028ca34c4>] slab_alloc mm/slab.c:3319 [inline]
    [<0000000028ca34c4>] kmem_cache_alloc_trace+0x145/0x2c0 mm/slab.c:3548
    [<0000000014a5159c>] kmalloc include/linux/slab.h:556 [inline]
    [<0000000014a5159c>] kzalloc include/linux/slab.h:690 [inline]
    [<0000000014a5159c>] cfserl_create+0x24/0x76 net/caif/cfserl.c:36
    [<00000000abef7260>] caif_device_notify+0x347/0x3bc net/caif/caif_dev.c:388
    [<0000000055e634e8>] notifier_call_chain+0x66/0xb0 kernel/notifier.c:95
    [<00000000d0ead4ef>] __raw_notifier_call_chain kernel/notifier.c:396 [inline]
    [<00000000d0ead4ef>] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:403
    [<00000000437c8cc1>] call_netdevice_notifiers_info+0x33/0x70 net/core/dev.c:1668
    [<00000000f35c3f5c>] call_netdevice_notifiers_extack net/core/dev.c:1680 [inline]
    [<00000000f35c3f5c>] call_netdevice_notifiers net/core/dev.c:1694 [inline]
    [<00000000f35c3f5c>] register_netdevice+0x445/0x610 net/core/dev.c:9115
    [<00000000b69f1bfb>] ldisc_open+0x1de/0x330 drivers/net/caif/caif_serial.c:353
    [<00000000b799a1b6>] tty_ldisc_open.isra.0+0x40/0x70 drivers/tty/tty_ldisc.c:469
    [<000000000af22fd9>] tty_set_ldisc+0x149/0x240 drivers/tty/tty_ldisc.c:596
    [<0000000050a9eba0>] tiocsetd drivers/tty/tty_io.c:2334 [inline]
    [<0000000050a9eba0>] tty_ioctl+0x366/0xa30 drivers/tty/tty_io.c:2594
    [<000000007a135823>] vfs_ioctl fs/ioctl.c:46 [inline]
    [<000000007a135823>] file_ioctl fs/ioctl.c:509 [inline]
    [<000000007a135823>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
    [<00000000633ea9ae>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
    [<00000000ab4478f7>] __do_sys_ioctl fs/ioctl.c:720 [inline]
    [<00000000ab4478f7>] __se_sys_ioctl fs/ioctl.c:718 [inline]
    [<00000000ab4478f7>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
    [<0000000052c1cb2a>] do_syscall_64+0x73/0x1f0 arch/x86/entry/common.c:290
    [<00000000a8763e0a>] entry_SYSCALL_64_after_hwframe+0x44/0xa9