netdev - Use-after-free access in j1939_session

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Date:   Mon, 12 Jul 2021 15:40:46 -0700
From:   Xiaochen Zou <xzou017@....edu>
To:     kernel@...gutronix.de, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, stable@...r.kernel.org
Subject: Use-after-free access in j1939_session_deactivate

Hi,
It looks like there are multiple use-after-free accesses in
j1939_session_deactivate()

static bool j1939_session_deactivate(struct j1939_session *session)
{
bool active;

j1939_session_list_lock(session->priv);
active = j1939_session_deactivate_locked(session); //session can be freed inside
j1939_session_list_unlock(session->priv); // It causes UAF read and write

return active;
}

session can be freed by
j1939_session_deactivate_locked->j1939_session_put->__j1939_session_release->j1939_session_destroy->kfree.
Therefore it makes the unlock function perform UAF access.


Best,
Xiaochen Zou
Department of Computer Science & Engineering
University of California, Riverside