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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Yang Yingliang <yangyingliang@huawei.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 164/667] pinctrl: renesas: rzn1: Fix possible null-ptr-deref in sh_pfc_map_resources()
Date:   Tue,  7 Jun 2022 18:57:09 +0200
Message-Id: <20220607164939.733678911@linuxfoundation.org>
In-Reply-To: <20220607164934.766888869@linuxfoundation.org>
References: <20220607164934.766888869@linuxfoundation.org>
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From: Yang Yingliang <yangyingliang@huawei.com>

[ Upstream commit 2f661477c2bb8068194dbba9738d05219f111c6e ]

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.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220429082637.1308182-2-yangyingliang@huawei.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pinctrl/renesas/pinctrl-rzn1.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzn1.c b/drivers/pinctrl/renesas/pinctrl-rzn1.c
index ef5fb25b6016..849d091205d4 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzn1.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzn1.c
@@ -865,17 +865,15 @@ static int rzn1_pinctrl_probe(struct platform_device *pdev)
 	ipctl->mdio_func[0] = -1;
 	ipctl->mdio_func[1] = -1;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	ipctl->lev1_protect_phys = (u32)res->start + 0x400;
-	ipctl->lev1 = devm_ioremap_resource(&pdev->dev, res);
+	ipctl->lev1 = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(ipctl->lev1))
 		return PTR_ERR(ipctl->lev1);
+	ipctl->lev1_protect_phys = (u32)res->start + 0x400;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	ipctl->lev2_protect_phys = (u32)res->start + 0x400;
-	ipctl->lev2 = devm_ioremap_resource(&pdev->dev, res);
+	ipctl->lev2 = devm_platform_get_and_ioremap_resource(pdev, 1, &res);
 	if (IS_ERR(ipctl->lev2))
 		return PTR_ERR(ipctl->lev2);
+	ipctl->lev2_protect_phys = (u32)res->start + 0x400;
 
 	ipctl->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(ipctl->clk))
-- 
2.35.1