[PATCH] phy: freescale: imx8qm-hsio: fix NULL pointer dereference

[Thomas Richard]

During the probe the refclk_pad pointer is set to NULL if the
'fsl,refclk-pad-mode' property is not defined in the devicetree node. But
in imx_hsio_configure_clk_pad() this pointer is unconditionally used which
could result in a NULL pointer dereference. So check the pointer before to
use it.

Fixes: 82c56b6dd24f ("phy: freescale: imx8qm-hsio: Add i.MX8QM HSIO PHY driver support")
Signed-off-by: Thomas Richard <thomas.richard at bootlin.com>
---
 drivers/phy/freescale/phy-fsl-imx8qm-hsio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/freescale/phy-fsl-imx8qm-hsio.c b/drivers/phy/freescale/phy-fsl-imx8qm-hsio.c
index 977d21d753a5..279b8ac7822d 100644
--- a/drivers/phy/freescale/phy-fsl-imx8qm-hsio.c
+++ b/drivers/phy/freescale/phy-fsl-imx8qm-hsio.c
@@ -251,7 +251,7 @@ static void imx_hsio_configure_clk_pad(struct phy *phy)
 	struct imx_hsio_lane *lane = phy_get_drvdata(phy);
 	struct imx_hsio_priv *priv = lane->priv;
 
-	if (strncmp(priv->refclk_pad, "output", 6) == 0) {
+	if (priv->refclk_pad && strncmp(priv->refclk_pad, "output", 6) == 0) {
 		pll = true;
 		regmap_update_bits(priv->misc, HSIO_CTRL0,
 				   HSIO_IOB_A_0_TXOE | HSIO_IOB_A_0_M1M0_MASK,

---
base-commit: c537e12daeecaecdcd322c56a5f70659d2de7bde
change-id: 20260114-phy-fsl-imx8qm-hsio-fix-null-pointer-dereference-67b110635f77

Best regards,
-- 
Thomas Richard <thomas.richard at bootlin.com>