[4.2.y-ckt stable] Patch "can: fix handling of unmodifiable configuration options fix" has been added to the 4.2.y-ckt tree

Kamal Mostafa kamal at canonical.com
Thu Jul 7 17:36:59 UTC 2016

This is a note to let you know that I have just added a patch titled

    can: fix handling of unmodifiable configuration options fix

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:


This patch is scheduled to be released in version 4.2.8-ckt13.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see



>From de82a2cd5b7cfbbefa070d622cd9b802cda343cf Mon Sep 17 00:00:00 2001
From: Oliver Hartkopp <socketcan at hartkopp.net>
Date: Tue, 21 Jun 2016 12:14:07 +0200
Subject: can: fix handling of unmodifiable configuration options fix

commit bce271f255dae8335dc4d2ee2c4531e09cc67f5a upstream.

With upstream commit bb208f144cf3f59 (can: fix handling of unmodifiable
configuration options) a new can_validate() function was introduced.

When invoking 'ip link set can0 type can' without any configuration data
can_validate() tries to validate the content without taking into account that
there's totally no content. This patch adds a check for missing content.

Reported-by: ajneu <ajneu1 at gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan at hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl at pengutronix.de>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 drivers/net/can/dev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 910c12e..348dd50 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -798,6 +798,9 @@ static int can_validate(struct nlattr *tb[], struct nlattr *data[])
 	 * - control mode with CAN_CTRLMODE_FD set

+	if (!data)
+		return 0;
 	if (data[IFLA_CAN_CTRLMODE]) {
 		struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);


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