linux-kernel - [PATCH] usb: gadget: add error handling for platform_get_resource

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Message-Id: <1528777942-40876-1-git-send-email-jiazhouyang09@gmail.com>
Date:   Tue, 12 Jun 2018 12:32:19 +0800
From:   Zhouyang Jia <jiazhouyang09@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Zhouyang Jia <jiazhouyang09@...il.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Kees Cook <keescook@...omium.org>,
        Allen Pais <allen.lkml@...il.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] usb: gadget: add error handling for platform_get_resource_byname

When platform_get_resource_byname fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling platform_get_resource_byname.

Signed-off-by: Zhouyang Jia <jiazhouyang09@...il.com>
---
 drivers/usb/gadget/udc/r8a66597-udc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/gadget/udc/r8a66597-udc.c b/drivers/usb/gadget/udc/r8a66597-udc.c
index a3ecce6..a7bd5e7 100644
--- a/drivers/usb/gadget/udc/r8a66597-udc.c
+++ b/drivers/usb/gadget/udc/r8a66597-udc.c
@@ -1830,6 +1830,11 @@ static int r8a66597_sudmac_ioremap(struct r8a66597 *r8a66597,
 	struct resource *res;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sudmac");
+	if (!res) {
+		dev_err(&pdev->dev, "could not allocate resource.\n");
+		return -ENODEV;
+	}
+
 	r8a66597->sudmac_reg = devm_ioremap_resource(&pdev->dev, res);
 	return PTR_ERR_OR_ZERO(r8a66597->sudmac_reg);
 }
-- 
2.7.4