[PATCH] phy: qcom-qmp-usb: Fix an NULL vs IS_ERR() bug

[Chenyuan Yang]

In qmp_usb_iomap(), one branch returns the result of devm_ioremap(), which
can be NULL. Since IS_ERR() does not catch a NULL pointer,
add an explicit NULL check in qmp_usb_parse_dt_legacy() to prevent
potential dereference issues.

Signed-off-by: Chenyuan Yang <chenyuan0y@xxxxxxxxx>
Fixes: 2a55ec4f0a04 ("phy: qcom-qmp-usb: merge driver data")
---
 drivers/phy/qualcomm/phy-qcom-qmp-usb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
index 787721570457..8dab20b0c11c 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c
@@ -2152,6 +2152,8 @@ static int qmp_usb_parse_dt_legacy(struct qmp_usb *qmp, struct device_node *np)
 		return PTR_ERR(qmp->rx);
 
 	qmp->pcs = qmp_usb_iomap(dev, np, 2, exclusive);
+	if (!qmp->pcs)
+		return -ENOMEM;
 	if (IS_ERR(qmp->pcs))
 		return PTR_ERR(qmp->pcs);
 
-- 
2.34.1