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Subjectmemory leak in lapb_register

syzbot found the following crash on:

HEAD commit: f49aa1de Merge tag 'for-5.2-rc1-tag' of git://git.kernel.o..
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:
C reproducer:

IMPORTANT: if you fix the bug, please add the following tag to the commit:

g: Permanently added '' (ECDSA) to the list of known hosts.
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88810dadc400 (size 256):
comm "softirq", pid 0, jiffies 4294947366 (age 12.720s)
hex dump (first 32 bytes):
00 01 00 00 00 00 ad de 00 02 00 00 00 00 ad de ................
00 20 85 17 81 88 ff ff 00 00 00 00 00 00 00 00 . ..............
[<00000000fe4f5aaf>] kmemleak_alloc_recursive
include/linux/kmemleak.h:55 [inline]
[<00000000fe4f5aaf>] slab_post_alloc_hook mm/slab.h:439 [inline]
[<00000000fe4f5aaf>] slab_alloc mm/slab.c:3326 [inline]
[<00000000fe4f5aaf>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
[<0000000050cea448>] kmalloc include/linux/slab.h:547 [inline]
[<0000000050cea448>] kzalloc include/linux/slab.h:742 [inline]
[<0000000050cea448>] lapb_create_cb net/lapb/lapb_iface.c:121 [inline]
[<0000000050cea448>] lapb_register+0x90/0x1c0 net/lapb/lapb_iface.c:158
[<00000000c0d81e26>] x25_asy_open drivers/net/wan/x25_asy.c:482 [inline]
[<00000000c0d81e26>] x25_asy_open_tty+0x26b/0x2f6
[<00000000bdec8ae5>] tty_ldisc_open.isra.0+0x40/0x70
[<000000004f64cfca>] tty_set_ldisc+0x149/0x240
[<00000000d8b98e91>] tiocsetd drivers/tty/tty_io.c:2332 [inline]
[<00000000d8b98e91>] tty_ioctl+0x366/0xa30 drivers/tty/tty_io.c:2592
[<00000000343f2123>] vfs_ioctl fs/ioctl.c:46 [inline]
[<00000000343f2123>] file_ioctl fs/ioctl.c:509 [inline]
[<00000000343f2123>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
[<00000000b777b7e5>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
[<0000000026d5db65>] __do_sys_ioctl fs/ioctl.c:720 [inline]
[<0000000026d5db65>] __se_sys_ioctl fs/ioctl.c:718 [inline]
[<0000000026d5db65>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
[<0000000006a4653e>] do_syscall_64+0x76/0x1a0
[<00000000e706c40e>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

executing program
executing program

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