linux-kernel - [PATCH 5.12 067/173] usb: misc: brcmstb-usb-pinmap: check return value after calling platform_get

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Date:   Mon, 14 Jun 2021 12:26:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yang Yingliang <yangyingliang@...wei.com>
Subject: [PATCH 5.12 067/173] usb: misc: brcmstb-usb-pinmap: check return value after calling platform_get_resource()

From: Yang Yingliang <yangyingliang@...wei.com>

commit fbf649cd6d64d40c03c5397ecd6b1ae922ba7afc upstream.

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Fixes: 517c4c44b323 ("usb: Add driver to allow any GPIO to be used for 7211 USB signals")
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Link: https://lore.kernel.org/r/20210605080914.2057758-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/misc/brcmstb-usb-pinmap.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/misc/brcmstb-usb-pinmap.c
+++ b/drivers/usb/misc/brcmstb-usb-pinmap.c
@@ -263,6 +263,8 @@ static int __init brcmstb_usb_pinmap_pro
 		return -EINVAL;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r)
+		return -EINVAL;
 
 	pdata = devm_kzalloc(&pdev->dev,
 			     sizeof(*pdata) +