linux-kernel - [PATCH 5.18 649/879] mfd: davinci_voicecodec: Fix possible null-ptr-deref davinci_vc

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Date:   Tue,  7 Jun 2022 19:02:47 +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>,
        Lee Jones <lee.jones@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 649/879] mfd: davinci_voicecodec: Fix possible null-ptr-deref davinci_vc_probe()

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

[ Upstream commit 311242c7703df0da14c206260b7e855f69cb0264 ]

It will cause null-ptr-deref when using 'res', if platform_get_resource()
returns NULL, so move using 'res' after devm_ioremap_resource() that
will check it to avoid null-ptr-deref.
And use devm_platform_get_and_ioremap_resource() to simplify code.

Fixes: b5e29aa880be ("mfd: davinci_voicecodec: Remove pointless #include")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Link: https://lore.kernel.org/r/20220426030857.3539336-1-yangyingliang@huawei.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mfd/davinci_voicecodec.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/davinci_voicecodec.c b/drivers/mfd/davinci_voicecodec.c
index e5c8bc998eb4..965820481f1e 100644
--- a/drivers/mfd/davinci_voicecodec.c
+++ b/drivers/mfd/davinci_voicecodec.c
@@ -46,14 +46,12 @@ static int __init davinci_vc_probe(struct platform_device *pdev)
 	}
 	clk_enable(davinci_vc->clk);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
-	fifo_base = (dma_addr_t)res->start;
-	davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
+	davinci_vc->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(davinci_vc->base)) {
 		ret = PTR_ERR(davinci_vc->base);
 		goto fail;
 	}
+	fifo_base = (dma_addr_t)res->start;
 
 	davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
 						   davinci_vc->base,
-- 
2.35.1