From: Aditya Pakki <pakki001@umn.edu>
Date: Mon, 18 Mar 2019 23:50:56 +0000 (-0500)
Subject: serial: mvebu-uart: Fix to avoid a potential NULL pointer dereference
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=32f47179833b63de72427131169809065db6745e;p=linux.git

serial: mvebu-uart: Fix to avoid a potential NULL pointer dereference

of_match_device on failure to find a matching device can return a NULL
pointer. The patch checks for such a scenrio and passes the error upstream.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index 231f751d1ef48..7e7b1559fa369 100644
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -810,6 +810,9 @@ static int mvebu_uart_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	if (!match)
+		return -ENODEV;
+
 	/* Assume that all UART ports have a DT alias or none has */
 	id = of_alias_get_id(pdev->dev.of_node, "serial");
 	if (!pdev->dev.of_node || id < 0)