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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Tuo Li <islituo@gmail.com>, TOTE Robot <oslab@tsinghua.edu.cn>,
        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 5.15 046/146] media: s5p-mfc: fix possible null-pointer dereference in s5p_mfc_probe()
Date:   Mon,  8 Nov 2021 12:43:13 -0500
Message-Id: <20211108174453.1187052-46-sashal@kernel.org>
In-Reply-To: <20211108174453.1187052-1-sashal@kernel.org>
References: <20211108174453.1187052-1-sashal@kernel.org>
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From: Tuo Li <islituo@gmail.com>

[ Upstream commit 8515965e5e33f4feb56134348c95953f3eadfb26 ]

The variable pdev is assigned to dev->plat_dev, and dev->plat_dev is
checked in:
  if (!dev->plat_dev)

This indicates both dev->plat_dev and pdev can be NULL. If so, the
function dev_err() is called to print error information.
  dev_err(&pdev->dev, "No platform data specified\n");

However, &pdev->dev is an illegal address, and it is dereferenced in
dev_err().

To fix this possible null-pointer dereference, replace dev_err() with
mfc_err().

Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Tuo Li <islituo@gmail.com>
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 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c b/drivers/media/platform/s5p-mfc/s5p_mfc.c
index eba2b9f040df0..c763c0a03140c 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c
@@ -1283,7 +1283,7 @@ static int s5p_mfc_probe(struct platform_device *pdev)
 	spin_lock_init(&dev->condlock);
 	dev->plat_dev = pdev;
 	if (!dev->plat_dev) {
-		dev_err(&pdev->dev, "No platform data specified\n");
+		mfc_err("No platform data specified\n");
 		return -ENODEV;
 	}
 
-- 
2.33.0