[PATCH] phy: usb: sunplus: Fix potential null-ptr-deref in sp_usb_phy_probe()

[Shang XiaoJing]

sp_usb_phy_probe() will call platform_get_resource_byname() that may fail
and return NULL. devm_ioremap() will use usbphy->moon4_res_mem->start as
input, which may causes null-ptr-deref. Check the ret value of
platform_get_resource_byname() to avoid the null-ptr-deref.

Fixes: 99d9ccd97385 ("phy: usb: Add USB2.0 phy driver for Sunplus SP7021")
Signed-off-by: Shang XiaoJing <shangxiaojing at huawei.com>
---
 drivers/phy/sunplus/phy-sunplus-usb2.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/phy/sunplus/phy-sunplus-usb2.c b/drivers/phy/sunplus/phy-sunplus-usb2.c
index b932087c55b2..6816b7d2318d 100644
--- a/drivers/phy/sunplus/phy-sunplus-usb2.c
+++ b/drivers/phy/sunplus/phy-sunplus-usb2.c
@@ -254,6 +254,9 @@ static int sp_usb_phy_probe(struct platform_device *pdev)
 		return PTR_ERR(usbphy->phy_regs);
 
 	usbphy->moon4_res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "moon4");
+	if (!usbphy->moon4_res_mem)
+		return -EINVAL;
+
 	usbphy->moon4_regs = devm_ioremap(&pdev->dev, usbphy->moon4_res_mem->start,
 					  resource_size(usbphy->moon4_res_mem));
 	if (IS_ERR(usbphy->moon4_regs))
-- 
2.17.1