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mac802154_llsec_key_del() can free resources of a key directly without
following the RCU rules for waiting before the end of a grace period. This
may lead to use-after-free in case llsec_lookup_key() is traversing the
list of keys in parallel with a key deletion:

refcount_t: addition on 0; use-after-free.
WARNING: CPU: 4 PID: 16000 at lib/refcount.c:25 refcount_warn_saturate+0x162/0x2a0
Modules linked in:
CPU: 4 PID: 16000 Comm: wpan-ping Not tainted 6.7.0 #19
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:refcount_warn_saturate+0x162/0x2a0
Call Trace:
 <TASK>
 llsec_lookup_key.isra.0+0x890/0x9e0
 mac802154_llsec_encrypt+0x30c/0x9c0
 ieee802154_subif_start_xmit+0x24/0x1e0
 dev_hard_start_xmit+0x13e/0x690
 sch_direct_xmit+0x2ae/0xbc0
 __dev_queue_xmit+0x11dd/0x3c20
 dgram_sendmsg+0x90b/0xd60
 __sys_sendto+0x466/0x4c0
 __x64_sys_sendto+0xe0/0x1c0
 do_syscall_64+0x45/0xf0
 entry_SYS...