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From:   Miaoqian Lin <linmq006@gmail.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jirislaby@kernel.org>,
        Joel Stanley <joel@jms.id.au>,
        Andrew Jeffery <andrew@aj.id.au>,
        Zev Weiss <zev@bewilderbeest.net>,
        Johan Hovold <johan@kernel.org>,
        Yang Guang <yang.guang5@zte.com.cn>,
        Miaoqian Lin <linmq006@gmail.com>,
        linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH] serial: 8250_aspeed_vuart: Fix potential NULL dereference in aspeed_vuart_probe
Date:   Mon,  4 Apr 2022 14:38:40 +0000
Message-Id: <20220404143842.16960-1-linmq006@gmail.com>
Precedence: bulk

platform_get_resource() may fail and return NULL, so we should
better check it's return value to avoid a NULL pointer dereference.

Fixes: 54da3e381c2b ("serial: 8250_aspeed_vuart: use UPF_IOREMAP to set up register mapping")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/tty/serial/8250/8250_aspeed_vuart.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c
index 93fe10c680fb..9d2a7856784f 100644
--- a/drivers/tty/serial/8250/8250_aspeed_vuart.c
+++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c
@@ -429,6 +429,8 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 	timer_setup(&vuart->unthrottle_timer, aspeed_vuart_unthrottle_exp, 0);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
 
 	memset(&port, 0, sizeof(port));
 	port.port.private_data = vuart;
-- 
2.17.1