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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>
This commit is contained in:
Aditya Pakki 2019-03-18 18:50:56 -05:00 committed by Greg Kroah-Hartman
parent 9e98c678c2
commit 32f4717983
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/mvebu-uart.c
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@ -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)