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Commit 48a10cdf authored by Julia Lawall's avatar Julia Lawall Committed by Kumar Gala
Browse files

drivers/serial/ucc_uart.c: Add of_node_put to avoid memory leak 

Add a call to of_node_put in the error handling code following a call to
of_find_compatible_node or of_find_node_by_type.

This patch also substantially reorganizes the error handling code in the
function, to that it is possible first to jump to code that frees qe_port
and then to jump to code that also puts np.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/

)

// <smpl>
@r exists@
local idexpression x;
expression E,E1,E2;
statement S;
@@

*x =
(of_find_node_by_path
|of_find_node_by_name
|of_find_node_by_phandle
|of_get_parent
|of_get_next_parent
|of_get_next_child
|of_find_compatible_node
|of_match_node
|of_find_node_by_type
|of_find_node_with_property
|of_find_matching_node
|of_parse_phandle
)(...);
...
if (x == NULL) S
<... when != x = E
*if (...) {
  ... when != of_node_put(x)
      when != if (...) { ... of_node_put(x); ... }
(
  return <+...x...+>;
|
*  return ...;
)
}
...>
(
E2 = x;
|
of_node_put(x);
)
// </smpl>

Signed-off-by: default avatarJulia Lawall <julia@diku.dk>
Acked-by: default avatarTimur Tabi <timur@freescale.com>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
parent afc0a07d

drivers/tty/serial/ucc_uart.c

+35 −32
Original line number Diff line number Diff line
@@ -1270,13 +1270,12 @@ static int ucc_uart_probe(struct platform_device *ofdev, 
	ret = of_address_to_resource(np, 0, &res);

	if (ret) {

		dev_err(&ofdev->dev, "missing 'reg' property in device tree\n");

		kfree(qe_port);

		return ret;

		goto out_free;

	}

	if (!res.start) {

		dev_err(&ofdev->dev, "invalid 'reg' property in device tree\n");

		kfree(qe_port);

		return -EINVAL;

		ret = -EINVAL;

		goto out_free;

	}

	qe_port->port.mapbase = res.start;
@@ -1286,17 +1285,17 @@ static int ucc_uart_probe(struct platform_device *ofdev, 
	if (!iprop) {

		iprop = of_get_property(np, "device-id", NULL);

		if (!iprop) {

			kfree(qe_port);

			dev_err(&ofdev->dev, "UCC is unspecified in "

				"device tree\n");

			return -EINVAL;

			ret = -EINVAL;

			goto out_free;

		}

	}



	if ((*iprop < 1) || (*iprop > UCC_MAX_NUM)) {

		dev_err(&ofdev->dev, "no support for UCC%u\n", *iprop);

		kfree(qe_port);

		return -ENODEV;

		ret = -ENODEV;

		goto out_free;

	}

	qe_port->ucc_num = *iprop - 1;
@@ -1310,16 +1309,16 @@ static int ucc_uart_probe(struct platform_device *ofdev, 
	sprop = of_get_property(np, "rx-clock-name", NULL);

	if (!sprop) {

		dev_err(&ofdev->dev, "missing rx-clock-name in device tree\n");

		kfree(qe_port);

		return -ENODEV;

		ret = -ENODEV;

		goto out_free;

	}



	qe_port->us_info.rx_clock = qe_clock_source(sprop);

	if ((qe_port->us_info.rx_clock < QE_BRG1) ||

	    (qe_port->us_info.rx_clock > QE_BRG16)) {

		dev_err(&ofdev->dev, "rx-clock-name must be a BRG for UART\n");

		kfree(qe_port);

		return -ENODEV;

		ret = -ENODEV;

		goto out_free;

	}



#ifdef LOOPBACK
@@ -1329,39 +1328,39 @@ static int ucc_uart_probe(struct platform_device *ofdev, 
	sprop = of_get_property(np, "tx-clock-name", NULL);

	if (!sprop) {

		dev_err(&ofdev->dev, "missing tx-clock-name in device tree\n");

		kfree(qe_port);

		return -ENODEV;

		ret = -ENODEV;

		goto out_free;

	}

	qe_port->us_info.tx_clock = qe_clock_source(sprop);

#endif

	if ((qe_port->us_info.tx_clock < QE_BRG1) ||

	    (qe_port->us_info.tx_clock > QE_BRG16)) {

		dev_err(&ofdev->dev, "tx-clock-name must be a BRG for UART\n");

		kfree(qe_port);

		return -ENODEV;

		ret = -ENODEV;

		goto out_free;

	}



	/* Get the port number, numbered 0-3 */

	iprop = of_get_property(np, "port-number", NULL);

	if (!iprop) {

		dev_err(&ofdev->dev, "missing port-number in device tree\n");

		kfree(qe_port);

		return -EINVAL;

		ret = -EINVAL;

		goto out_free;

	}

	qe_port->port.line = *iprop;

	if (qe_port->port.line >= UCC_MAX_UART) {

		dev_err(&ofdev->dev, "port-number must be 0-%u\n",

			UCC_MAX_UART - 1);

		kfree(qe_port);

		return -EINVAL;

		ret = -EINVAL;

		goto out_free;

	}



	qe_port->port.irq = irq_of_parse_and_map(np, 0);

	if (qe_port->port.irq == NO_IRQ) {

		dev_err(&ofdev->dev, "could not map IRQ for UCC%u\n",

		       qe_port->ucc_num + 1);

		kfree(qe_port);

		return -EINVAL;

		ret = -EINVAL;

		goto out_free;

	}



	/*
@@ -1373,8 +1372,8 @@ static int ucc_uart_probe(struct platform_device *ofdev, 
		np = of_find_node_by_type(NULL, "qe");

		if (!np) {

			dev_err(&ofdev->dev, "could not find 'qe' node\n");

			kfree(qe_port);

			return -EINVAL;

			ret = -EINVAL;

			goto out_free;

		}

	}
@@ -1382,8 +1381,8 @@ static int ucc_uart_probe(struct platform_device *ofdev, 
	if (!iprop) {

		dev_err(&ofdev->dev,

		       "missing brg-frequency in device tree\n");

		kfree(qe_port);

		return -EINVAL;

		ret = -EINVAL;

		goto out_np;

	}



	if (*iprop)
@@ -1398,16 +1397,16 @@ static int ucc_uart_probe(struct platform_device *ofdev, 
		if (!iprop) {

			dev_err(&ofdev->dev,

				"missing QE bus-frequency in device tree\n");

			kfree(qe_port);

			return -EINVAL;

			ret = -EINVAL;

			goto out_np;

		}

		if (*iprop)

			qe_port->port.uartclk = *iprop / 2;

		else {

			dev_err(&ofdev->dev,

				"invalid QE bus-frequency in device tree\n");

			kfree(qe_port);

			return -EINVAL;

			ret = -EINVAL;

			goto out_np;

		}

	}
@@ -1445,8 +1444,7 @@ static int ucc_uart_probe(struct platform_device *ofdev, 
	if (ret) {

		dev_err(&ofdev->dev, "could not add /dev/ttyQE%u\n",

		       qe_port->port.line);

		kfree(qe_port);

		return ret;

		goto out_np;

	}



	dev_set_drvdata(&ofdev->dev, qe_port);
@@ -1460,6 +1458,11 @@ static int ucc_uart_probe(struct platform_device *ofdev, 
	       SERIAL_QE_MINOR + qe_port->port.line);



	return 0;

out_np:

	of_node_put(np);

out_free:

	kfree(qe_port);

	return ret;

}



static int ucc_uart_remove(struct platform_device *ofdev)