linux-kernel - [PATCH] usb: gadget: r8a66597: Add missing null check on return from platform_get

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Message-Id: <20210406184510.433497-1-colin.king@canonical.com>
Date:   Tue,  6 Apr 2021 19:45:10 +0100
From:   Colin King <colin.king@...onical.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yoshihiro Shimoda <shimoda.yoshihiro@...esas.com>,
        Paul Mundt <lethal@...ux-sh.org>, linux-usb@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb: gadget: r8a66597: Add missing null check on return from platform_get_resource

From: Colin Ian King <colin.king@...onical.com>

The call to platform_get_resource can potentially return a NULL pointer
on failure, so add this check and return -EINVAL if it fails.

Addresses-Coverity: ("Dereference null return")
Fixes: c41442474a26 ("usb: gadget: R8A66597 peripheral controller support.")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/usb/gadget/udc/r8a66597-udc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/udc/r8a66597-udc.c b/drivers/usb/gadget/udc/r8a66597-udc.c
index 896c1a016d55..65cae4883454 100644
--- a/drivers/usb/gadget/udc/r8a66597-udc.c
+++ b/drivers/usb/gadget/udc/r8a66597-udc.c
@@ -1849,6 +1849,8 @@ static int r8a66597_probe(struct platform_device *pdev)
 		return PTR_ERR(reg);
 
 	ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!ires)
+		return -EINVAL;
 	irq = ires->start;
 	irq_trigger = ires->flags & IRQF_TRIGGER_MASK;
 
-- 
2.30.2