netdev - [PATCH 0/1] can: fix a potential UAF access in j1939_session

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Message-ID: <aa64ef28-35d8-9deb-2756-8080296b7e3e@ucr.edu>
Date:   Tue, 13 Jul 2021 13:21:44 -0700
From:   Xiaochen Zou <xzou017@....edu>
To:     greg@...ah.com
Cc:     stable@...r.kernel.org, netdev@...r.kernel.org,
        linux-can@...r.kernel.org
Subject: [PATCH 0/1] can: fix a potential UAF access in
 j1939_session_deactivate()


Xiaochen Zou (1):
  can: fix a potential UAF access in j1939_session_deactivate(). Both
    session and session->priv may be freed in
    j1939_session_deactivate_locked(). It leads to potential UAF read
    and write in j1939_session_list_unlock(). The free chain is

j1939_session_deactivate_locked()->j1939_session_put()->__j1939_session_release()->j1939_session_destroy().
    To fix this bug, I moved j1939_session_put() behind
    j1939_session_deactivate_locked(), and guarded it with a check of
    active since the session would be freed only if active is true.

 net/can/j1939/transport.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

-- 
2.17.1

>From 9c4733d093e05db22eb89825579c83e020c3c1a6 Mon Sep 17 00:00:00 2001
From: Xiaochen Zou <xzou017@....edu>
Date: Tue, 13 Jul 2021 13:15:59 -0700
Subject: [PATCH 1/1] can: fix a potential UAF access in
 j1939_session_deactivate().
To: greg@...ah.com
Cc: stable@...r.kernel.org,netdev@...r.kernel.org,linux-can@...r.kernel.org
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