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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Nadezda Lutovinova <lutovinova@ispras.ru>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        Sasha Levin <sashal@kernel.org>, a.hajda@samsung.com,
        mchehab@kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-media@vger.kernel.org
Subject: [PATCH AUTOSEL 5.15 047/146] media: s5p-mfc: Add checking to s5p_mfc_probe().
Date:   Mon,  8 Nov 2021 12:43:14 -0500
Message-Id: <20211108174453.1187052-47-sashal@kernel.org>
In-Reply-To: <20211108174453.1187052-1-sashal@kernel.org>
References: <20211108174453.1187052-1-sashal@kernel.org>
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From: Nadezda Lutovinova <lutovinova@ispras.ru>

[ Upstream commit cdfaf4752e6915a4b455ad4400133e540e4dc965 ]

If of_device_get_match_data() return NULL,
then null pointer dereference occurs in  s5p_mfc_init_pm().
The patch adds checking if dev->variant is NULL.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/platform/s5p-mfc/s5p_mfc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c b/drivers/media/platform/s5p-mfc/s5p_mfc.c
index c763c0a03140c..f336a95432732 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c
@@ -1288,6 +1288,10 @@ static int s5p_mfc_probe(struct platform_device *pdev)
 	}
 
 	dev->variant = of_device_get_match_data(&pdev->dev);
+	if (!dev->variant) {
+		dev_err(&pdev->dev, "Failed to get device MFC hardware variant information\n");
+		return -ENOENT;
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	dev->regs_base = devm_ioremap_resource(&pdev->dev, res);
-- 
2.33.0