clk: bcm: rpi: Add NULL check in raspberrypi_clk_register()

devm_kasprintf() returns NULL when memory allocation fails. Currently,
raspberrypi_clk_register() does not check for this case, which results
in a NULL pointer dereference.

Add NULL check after devm_kasprintf() to prevent this issue.

Fixes: 93d2725 ("clk: bcm: rpi: Discover the firmware clocks")
Signed-off-by: Henry Martin <[email protected]>
Reviewed-by: Dave Stevenson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Stefan Wahren <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

Author: Henry Martin

drivers/clk/bcm/clk-raspberrypi.c

@@ -286,6 +286,8 @@ static struct clk_hw *raspberrypi_clk_register(struct raspberrypi_clk *rpi,
 	init.name = devm_kasprintf(rpi->dev, GFP_KERNEL,
 				   "fw-clk-%s",
 				   rpi_firmware_clk_names[id]);
+	if (!init.name)
+		return ERR_PTR(-ENOMEM);
 	init.ops = &raspberrypi_firmware_clk_ops;
 	init.flags = CLK_GET_RATE_NOCACHE;