This is a note to let you know that I've just added the patch titled
can: dev: fix crtlmode_supported check
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
can-dev-fix-crtlmode_supported-check.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9b1087aa5e86448fe6ad40a58964e35f3ba423d5 Mon Sep 17 00:00:00 2001
From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Date: Mon, 5 Jan 2015 18:40:15 +0100
Subject: can: dev: fix crtlmode_supported check
From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
commit 9b1087aa5e86448fe6ad40a58964e35f3ba423d5 upstream.
When changing flags in the CAN drivers ctrlmode the provided new content has to
be checked whether the bits are allowed to be changed. The bits that are to be
changed are given as a bitfield in cm->mask. Therefore checking against
cm->flags is wrong as the content can hold any kind of values.
The iproute2 tool sets the bits in cm->mask and cm->flags depending on the
detected command line options. To be robust against bogus user space
applications additionally sanitize the provided flags with the provided mask.
Cc: Wolfgang Grandegger <wg@xxxxxxxxxxxxxx>
Signed-off-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/dev.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -729,10 +729,14 @@ static int can_changelink(struct net_dev
if (dev->flags & IFF_UP)
return -EBUSY;
cm = nla_data(data[IFLA_CAN_CTRLMODE]);
- if (cm->flags & ~priv->ctrlmode_supported)
+
+ /* check whether changed bits are allowed to be modified */
+ if (cm->mask & ~priv->ctrlmode_supported)
return -EOPNOTSUPP;
+
+ /* clear bits to be modified and copy the flag values */
priv->ctrlmode &= ~cm->mask;
- priv->ctrlmode |= cm->flags;
+ priv->ctrlmode |= (cm->flags & cm->mask);
/* CAN_CTRLMODE_FD can only be set when driver supports FD */
if (priv->ctrlmode & CAN_CTRLMODE_FD)
Patches currently in stable-queue which might be from socketcan@xxxxxxxxxxxx are
queue-3.18/can-m_can-tag-current-can-fd-controllers-as-non-iso.patch
queue-3.18/can-dev-fix-crtlmode_supported-check.patch
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