linux-kernel - [PATCH] tty: serial: samsung_tty: Check null pointer after calling of_match

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Date:   Tue, 11 Jan 2022 16:16:47 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     krzysztof.kozlowski@...onical.com, gregkh@...uxfoundation.org,
        jirislaby@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] tty: serial: samsung_tty: Check null pointer after calling of_match_node

If there is no suitable node, of_match_node() will return NULL pointer.
Therefore it should be better to check it in order to avoid the
dereference of NULL pointer.
And the only caller s3c24xx_serial_probe() has already checked the
return value of the s3c24xx_get_driver_data().
So the new check can be dealed with.

Fixes: 55ed51fff224 ("{tty: serial, nand: onenand}: samsung: rename to fix build warning")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/tty/serial/samsung_tty.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index e2f49863e9c2..efbf9a7d5e92 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -2185,6 +2185,9 @@ s3c24xx_get_driver_data(struct platform_device *pdev)
 		const struct of_device_id *match;
 
 		match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
+		if (!match)
+			return NULL;
+
 		return (struct s3c24xx_serial_drv_data *)match->data;
 	}
 #endif
-- 
2.25.1