serial: pic32: Add checks for devm_clk_get() in pic32_uart_probe()

As the devm_clk_get() may return ERR_PTR, its return value needs to be
checked to avoid invalid poineter dereference.

Signed-off-by: Yuan Can <yuancan@huawei.com>
Link: https://lore.kernel.org/r/20221125093832.33386-1-yuancan@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/pic32_uart.c b/drivers/tty/serial/pic32_uart.c
index ba3435263c1f77d6f672c54f7d3bd38bec09929f..196a4e67845102ede82ecee800d1f8204784e3b0 100644 (file)
--- a/drivers/tty/serial/pic32_uart.c
+++ b/drivers/tty/serial/pic32_uart.c
@@ -889,6 +889,8 @@ static int pic32_uart_probe(struct platform_device *pdev)
        sport->irq_rx           = irq_of_parse_and_map(np, 1);
        sport->irq_tx           = irq_of_parse_and_map(np, 2);
        sport->clk              = devm_clk_get(&pdev->dev, NULL);
+       if (IS_ERR(sport->clk))
+               return PTR_ERR(sport->clk);
        sport->dev              = &pdev->dev;
 
        /* Hardware flow control: gpios