CVE-2024-56654

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hcievent: Fix using rcuread_(un)lock while iterating

The usage of rcuread(un)lock while inside listforeachentryrcu is not safe since for the most part entries fetched this way shall be treated as rcu_dereference:

Note that the value returned by rcu_dereference() is valid
only within the enclosing RCU read-side critical section [1]_.
For example, the following is **not** legal::

    rcu_read_lock();
    p = rcu_dereference(head.next);
    rcu_read_unlock();
    x = p->address; /* BUG!!! */
    rcu_read_lock();
    y = p->data;    /* BUG!!! */
    rcu_read_unlock();