linux-kernel - [PATCH] media: s5p-mfc: fix possible null-pointer dereference in s5p_mfc

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Date:   Thu,  5 Aug 2021 00:55:35 -0700
From:   Tuo Li <islituo@...il.com>
To:     a.hajda@...sung.com, mchehab@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, baijiaju1990@...il.com,
        Tuo Li <islituo@...il.com>, TOTE Robot <oslab@...nghua.edu.cn>
Subject: [PATCH] media: s5p-mfc: fix possible null-pointer dereference in s5p_mfc_probe()

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 infomation.
  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@...nghua.edu.cn>
Signed-off-by: Tuo Li <islituo@...il.com>
---
 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 eba2b9f040df..c763c0a03140 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;
 	}
 
-- 
2.25.1