From: Wen Yang wen.yang99@zte.com.cn

The gpr_np variable is still being used in dev_dbg() after the of_node_put() call, which may result in use-after-free.

Fixes: de3578c198c6 ("can: flexcan: add self wakeup support") Signed-off-by: Wen Yang wen.yang99@zte.com.cn Cc: linux-stable stable@vger.kernel.org # >= v5.0 Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de --- drivers/net/can/flexcan.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index f2fe344593d5..33ce45d51e15 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -1437,10 +1437,10 @@ static int flexcan_setup_stop_mode(struct platform_device *pdev)

priv = netdev_priv(dev); priv->stm.gpr = syscon_node_to_regmap(gpr_np); - of_node_put(gpr_np); if (IS_ERR(priv->stm.gpr)) { dev_dbg(&pdev->dev, "could not find gpr regmap\n"); - return PTR_ERR(priv->stm.gpr); + ret = PTR_ERR(priv->stm.gpr); + goto out_put_node; }

priv->stm.req_gpr = out_val[1]; @@ -1455,7 +1455,9 @@ static int flexcan_setup_stop_mode(struct platform_device *pdev)

device_set_wakeup_capable(&pdev->dev, true);

- return 0; +out_put_node: + of_node_put(gpr_np); + return ret; }

static const struct of_device_id flexcan_of_match[] = {