linux-kernel - [PATCH] mfd: tps6105x: Fix NULL pointer access.

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Date:	Fri, 4 Sep 2015 15:14:40 +0000
From:	Grigoryev Denis <grigoryev@...twel.ru>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH] mfd: tps6105x: Fix NULL pointer access.

When tps6105x used in TPS6105X_MODE_SHUTDOWN mode the driver calls
mfd_add_devices() with mfd_cell->name == NULL, that causes an ooops in
platform_device_register() later.

This patch reorders mfd_cell structures and makes code to call
mfd_add_devices() with proper number of cells.

Signed-off-by: Denis Grigoryev <grigoryev@....prosoft.ru>
---
 drivers/mfd/tps6105x.c |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/mfd/tps6105x.c b/drivers/mfd/tps6105x.c
index 5de95c2..be2c286 100644
--- a/drivers/mfd/tps6105x.c
+++ b/drivers/mfd/tps6105x.c
@@ -124,11 +124,11 @@ static int tps6105x_startup(struct tps6105x *tps6105x)
  */
 static struct mfd_cell tps6105x_cells[] = {
 	{
-		/* name will be runtime assigned */
+		.name = "tps6105x-gpio",
 		.id = -1,
 	},
 	{
-		.name = "tps6105x-gpio",
+		/* name will be runtime assigned */
 		.id = -1,
 	},
 };
@@ -138,6 +138,7 @@ static int tps6105x_probe(struct i2c_client *client,
 {
 	struct tps6105x			*tps6105x;
 	struct tps6105x_platform_data	*pdata;
+	int n_cells = ARRAY_SIZE(tps6105x_cells);
 	int ret;
 	int i;
 
@@ -162,33 +163,34 @@ static int tps6105x_probe(struct i2c_client *client,
 	case TPS6105X_MODE_SHUTDOWN:
 		dev_info(&client->dev,
 			 "present, not used for anything, only GPIO\n");
+		n_cells = 1;
 		break;
 	case TPS6105X_MODE_TORCH:
-		tps6105x_cells[0].name = "tps6105x-leds";
+		tps6105x_cells[1].name = "tps6105x-leds";
 		dev_warn(&client->dev,
 			 "torch mode is unsupported\n");
 		break;
 	case TPS6105X_MODE_TORCH_FLASH:
-		tps6105x_cells[0].name = "tps6105x-flash";
+		tps6105x_cells[1].name = "tps6105x-flash";
 		dev_warn(&client->dev,
 			 "flash mode is unsupported\n");
 		break;
 	case TPS6105X_MODE_VOLTAGE:
-		tps6105x_cells[0].name ="tps6105x-regulator";
+		tps6105x_cells[1].name = "tps6105x-regulator";
 		break;
 	default:
 		break;
 	}
 
 	/* Set up and register the platform devices. */
-	for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
+	for (i = 0; i < n_cells; i++) {
 		/* One state holder for all drivers, this is simple */
 		tps6105x_cells[i].platform_data = tps6105x;
 		tps6105x_cells[i].pdata_size = sizeof(*tps6105x);
 	}
 
 	return mfd_add_devices(&client->dev, 0, tps6105x_cells,
-			       ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL);
+			       n_cells, NULL, 0, NULL);
 }
 
 static int tps6105x_remove(struct i2c_client *client)
-- 
1.7.10.4