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From: Nadezda Lutovinova <lutovinova@ispras.ru>
To: Andrzej Hajda <a.hajda@samsung.com>
Cc: Nadezda Lutovinova <lutovinova@ispras.ru>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
	ldv-project@linuxtesting.org
Subject: [PATCH] media: s5p-mfc: Add checking to s5p_mfc_probe().
Date: Wed, 11 Aug 2021 16:32:28 +0300	[thread overview]
Message-ID: <20210811133228.14657-1-lutovinova@ispras.ru> (raw)

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>
---
 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 eba2b9f040df..b56ff75cb9cc 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);
-- 
2.17.1


                 reply	other threads:[~2021-08-11 13:32 UTC|newest]

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