[PATCH net 13/22] can: sun4i_can: sun4ican_probe(): fix clk leak
flat view
COLD19d
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: 2026-09-28 19:33:27
Also in:
linux-can, stable
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
From: Wentao Liang <redacted>
In sun4ican_probe(), the clock is obtained with of_clk_get(), which returns
a reference that must be released with clk_put(). If platform_get_irq(),
devm_platform_ioremap_resource(), alloc_candev() or register_candev()
fails, the reference is never released, leaking the clock.
Fix this by adding an exit_put_clk label that releases the clock and
jumping to it from all error paths after the of_clk_get() call.
Fixes: 0738eff14d81 ("can: Allwinner A10/A20 CAN Controller support - Kernel module")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <redacted>
Link: https://patch.msgid.link/20260917104514.2147347-1-vulab@iscas.ac.cn (local)
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
drivers/net/can/sun4i_can.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index af52285d5a4e..311526107ed8 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c@@ -854,13 +854,13 @@ static int sun4ican_probe(struct platform_device *pdev) irq = platform_get_irq(pdev, 0); if (irq < 0) { err = -ENODEV; - goto exit; + goto exit_put_clk; } addr = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(addr)) { err = PTR_ERR(addr); - goto exit; + goto exit_put_clk; } dev = alloc_candev(sizeof(struct sun4ican_priv), 1);
@@ -868,7 +868,7 @@ static int sun4ican_probe(struct platform_device *pdev) dev_err(&pdev->dev, "could not allocate memory for CAN device\n"); err = -ENOMEM; - goto exit; + goto exit_put_clk; } dev->netdev_ops = &sun4ican_netdev_ops;
@@ -908,6 +908,8 @@ static int sun4ican_probe(struct platform_device *pdev) exit_free: free_candev(dev); +exit_put_clk: + clk_put(clk); exit: return err; }
--
2.53.0