From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit bce271f255dae8335dc4d2ee2c4531e09cc67f5a ]
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@xxxxxxxxx>
Signed-off-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
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 80185eb..96712b8 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -717,6 +717,9 @@ 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]);
--
2.5.0
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