linux-kernel - [PATCH 2/2] tty: serial: fsl_lpuart: fix the potential bug of dereference null return value

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Message-Id: <20210426074935.11131-3-sherry.sun@nxp.com>
Date:   Mon, 26 Apr 2021 15:49:35 +0800
From:   Sherry Sun <sherry.sun@....com>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx@....com
Subject: [PATCH 2/2] tty: serial: fsl_lpuart: fix the potential bug of dereference null return value

This issue is reported by Coverity Check.
In lpuart_probe, return value of function which returns null is
dereferenced without checking.

Signed-off-by: Sherry Sun <sherry.sun@....com>
---
 drivers/tty/serial/fsl_lpuart.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 777d54b593f8..c95e71fd2ca0 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -2589,6 +2589,9 @@ static int lpuart_probe(struct platform_device *pdev)
 	struct resource *res;
 	int ret;
 
+	if (!sdata)
+		return -ENODEV;
+
 	sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL);
 	if (!sport)
 		return -ENOMEM;
-- 
2.17.1