linux-kernel - [PATCH] reset: uniphier-glue: Fix possible null-ptr-deref

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Date:   Mon, 14 Nov 2022 08:49:58 +0800
From:   Hui Tang <tanghui20@...wei.com>
To:     <p.zabel@...gutronix.de>, <hayashi.kunihiko@...ionext.com>,
        <mhiramat@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <weiyongjun1@...wei.com>
Subject: [PATCH] reset: uniphier-glue: Fix possible null-ptr-deref

It will cause null-ptr-deref when resource_size(res) invoked,
if platform_get_resource() returns NULL.

Fixes: 499fef09a323 ("reset: uniphier: add USB3 core reset control")
Signed-off-by: Hui Tang <tanghui20@...wei.com>
---
 drivers/reset/reset-uniphier-glue.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/reset/reset-uniphier-glue.c b/drivers/reset/reset-uniphier-glue.c
index 146fd5d45e99..15abac9fc72c 100644
--- a/drivers/reset/reset-uniphier-glue.c
+++ b/drivers/reset/reset-uniphier-glue.c
@@ -47,7 +47,6 @@ static int uniphier_glue_reset_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct uniphier_glue_reset_priv *priv;
 	struct resource *res;
-	resource_size_t size;
 	int i, ret;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -60,7 +59,6 @@ static int uniphier_glue_reset_probe(struct platform_device *pdev)
 		return -EINVAL;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	size = resource_size(res);
 	priv->rdata.membase = devm_ioremap_resource(dev, res);
 	if (IS_ERR(priv->rdata.membase))
 		return PTR_ERR(priv->rdata.membase);
@@ -96,7 +94,7 @@ static int uniphier_glue_reset_probe(struct platform_device *pdev)
 
 	spin_lock_init(&priv->rdata.lock);
 	priv->rdata.rcdev.owner = THIS_MODULE;
-	priv->rdata.rcdev.nr_resets = size * BITS_PER_BYTE;
+	priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;
 	priv->rdata.rcdev.ops = &reset_simple_ops;
 	priv->rdata.rcdev.of_node = dev->of_node;
 	priv->rdata.active_low = true;
-- 
2.17.1