[PATCH v5] mfd: tps6105x: Fix possible NULL pointer access.

[PATCH v5] mfd: tps6105x: Fix possible NULL pointer access.

[Grigoryev Denis]

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tps6105 driver provides two cells. One is for GPIO and another one is
for selected mode depending on platform data. When tps6105x is used in
GPIO-only mode, this driver calls mfd_add_devices() with mfd_cell
.name == NULL. This value causes an oops in platform_device_register()
later.

The following patch adds a mfd_cell for each possible mode thereby
excluding .name assignment in runtime.

Signed-off-by: Denis Grigoryev <grigoryev@fastwel.ru>
---
 drivers/mfd/tps6105x.c |   72 +++++++++++++++++++++++++++++-------------------
 1 file changed, 43 insertions(+), 29 deletions(-)

diff --git a/drivers/mfd/tps6105x.c b/drivers/mfd/tps6105x.c
index 5de95c2..182ebe0 100644
--- a/drivers/mfd/tps6105x.c
+++ b/drivers/mfd/tps6105x.c
@@ -119,27 +119,47 @@ static int tps6105x_startup(struct tps6105x *tps6105x)
 }
 
 /*
- * MFD cells - we have one cell which is selected operation
- * mode, and we always have a GPIO cell.
+ * MFD cells - we always have a GPIO cell and we have one cell
+ * which is selected operation mode.
  */
-static struct mfd_cell tps6105x_cells[] = {
-	{
-		/* name will be runtime assigned */
-		.id = -1,
-	},
-	{
-		.name = "tps6105x-gpio",
-		.id = -1,
-	},
+static struct mfd_cell tps6105x_gpio_cell = {
+	.name = "tps6105x-gpio",
+};
+
+static struct mfd_cell tps6105x_leds_cell = {
+	.name = "tps6105x-leds",
+};
+
+static struct mfd_cell tps6105x_flash_cell = {
+	.name = "tps6105x-flash",
 };
 
+static struct mfd_cell tps6105x_regulator_cell = {
+	.name = "tps6105x-regulator",
+};
+
+static int tps6105x_add_device(struct tps6105x *tps6105x,
+			       struct mfd_cell *cell)
+{
+	cell->platform_data = tps6105x;
+	cell->pdata_size = sizeof(*tps6105x);
+
+	return mfd_add_devices(&tps6105x->client->dev,
+			       PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
+}
+
 static int tps6105x_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct tps6105x			*tps6105x;
 	struct tps6105x_platform_data	*pdata;
 	int ret;
-	int i;
+
+	pdata = dev_get_platdata(&client->dev);
+	if (!pdata) {
+		dev_err(&client->dev, "missing platform data\n");
+		return -ENODEV;
+	}
 
 	tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
 	if (!tps6105x)
@@ -147,7 +167,6 @@ static int tps6105x_probe(struct i2c_client *client,
 
 	i2c_set_clientdata(client, tps6105x);
 	tps6105x->client = client;
-	pdata = dev_get_platdata(&client->dev);
 	tps6105x->pdata = pdata;
 	mutex_init(&tps6105x->lock);
 
@@ -157,38 +176,33 @@ static int tps6105x_probe(struct i2c_client *client,
 		return ret;
 	}
 
-	/* Remove warning texts when you implement new cell drivers */
+	ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
+	if (ret)
+		return ret;
+
 	switch (pdata->mode) {
 	case TPS6105X_MODE_SHUTDOWN:
 		dev_info(&client->dev,
 			 "present, not used for anything, only GPIO\n");
 		break;
 	case TPS6105X_MODE_TORCH:
-		tps6105x_cells[0].name = "tps6105x-leds";
-		dev_warn(&client->dev,
-			 "torch mode is unsupported\n");
+		ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
 		break;
 	case TPS6105X_MODE_TORCH_FLASH:
-		tps6105x_cells[0].name = "tps6105x-flash";
-		dev_warn(&client->dev,
-			 "flash mode is unsupported\n");
+		ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
 		break;
 	case TPS6105X_MODE_VOLTAGE:
-		tps6105x_cells[0].name ="tps6105x-regulator";
+		ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
 		break;
 	default:
+		dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
 		break;
 	}
 
-	/* Set up and register the platform devices. */
-	for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
-		/* One state holder for all drivers, this is simple */
-		tps6105x_cells[i].platform_data = tps6105x;
-		tps6105x_cells[i].pdata_size = sizeof(*tps6105x);
-	}
+	if (ret)
+		mfd_remove_devices(&client->dev);
 
-	return mfd_add_devices(&client->dev, 0, tps6105x_cells,
-			       ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL);
+	return ret;
 }
 
 static int tps6105x_remove(struct i2c_client *client)
-- 
1.7.10.4

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Re: [PATCH v5] mfd: tps6105x: Fix possible NULL pointer access.

[Lee Jones]

On Fri, 25 Sep 2015, Grigoryev Denis wrote:

> tps6105 driver provides two cells. One is for GPIO and another one is
> for selected mode depending on platform data. When tps6105x is used in
> GPIO-only mode, this driver calls mfd_add_devices() with mfd_cell
> .name == NULL. This value causes an oops in platform_device_register()
> later.
> 
> The following patch adds a mfd_cell for each possible mode thereby
> excluding .name assignment in runtime.
> 
> Signed-off-by: Denis Grigoryev <grigoryev@fastwel.ru>
> ---
>  drivers/mfd/tps6105x.c |   72 +++++++++++++++++++++++++++++-------------------
>  1 file changed, 43 insertions(+), 29 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/tps6105x.c b/drivers/mfd/tps6105x.c
> index 5de95c2..182ebe0 100644
> --- a/drivers/mfd/tps6105x.c
> +++ b/drivers/mfd/tps6105x.c
> @@ -119,27 +119,47 @@ static int tps6105x_startup(struct tps6105x *tps6105x)
>  }
>  
>  /*
> - * MFD cells - we have one cell which is selected operation
> - * mode, and we always have a GPIO cell.
> + * MFD cells - we always have a GPIO cell and we have one cell
> + * which is selected operation mode.
>   */
> -static struct mfd_cell tps6105x_cells[] = {
> -	{
> -		/* name will be runtime assigned */
> -		.id = -1,
> -	},
> -	{
> -		.name = "tps6105x-gpio",
> -		.id = -1,
> -	},
> +static struct mfd_cell tps6105x_gpio_cell = {
> +	.name = "tps6105x-gpio",
> +};
> +
> +static struct mfd_cell tps6105x_leds_cell = {
> +	.name = "tps6105x-leds",
> +};
> +
> +static struct mfd_cell tps6105x_flash_cell = {
> +	.name = "tps6105x-flash",
>  };
>  
> +static struct mfd_cell tps6105x_regulator_cell = {
> +	.name = "tps6105x-regulator",
> +};
> +
> +static int tps6105x_add_device(struct tps6105x *tps6105x,
> +			       struct mfd_cell *cell)
> +{
> +	cell->platform_data = tps6105x;
> +	cell->pdata_size = sizeof(*tps6105x);
> +
> +	return mfd_add_devices(&tps6105x->client->dev,
> +			       PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
> +}
> +
>  static int tps6105x_probe(struct i2c_client *client,
>  			const struct i2c_device_id *id)
>  {
>  	struct tps6105x			*tps6105x;
>  	struct tps6105x_platform_data	*pdata;
>  	int ret;
> -	int i;
> +
> +	pdata = dev_get_platdata(&client->dev);
> +	if (!pdata) {
> +		dev_err(&client->dev, "missing platform data\n");
> +		return -ENODEV;
> +	}
>  
>  	tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
>  	if (!tps6105x)
> @@ -147,7 +167,6 @@ static int tps6105x_probe(struct i2c_client *client,
>  
>  	i2c_set_clientdata(client, tps6105x);
>  	tps6105x->client = client;
> -	pdata = dev_get_platdata(&client->dev);
>  	tps6105x->pdata = pdata;
>  	mutex_init(&tps6105x->lock);
>  
> @@ -157,38 +176,33 @@ static int tps6105x_probe(struct i2c_client *client,
>  		return ret;
>  	}
>  
> -	/* Remove warning texts when you implement new cell drivers */
> +	ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
> +	if (ret)
> +		return ret;
> +
>  	switch (pdata->mode) {
>  	case TPS6105X_MODE_SHUTDOWN:
>  		dev_info(&client->dev,
>  			 "present, not used for anything, only GPIO\n");
>  		break;
>  	case TPS6105X_MODE_TORCH:
> -		tps6105x_cells[0].name = "tps6105x-leds";
> -		dev_warn(&client->dev,
> -			 "torch mode is unsupported\n");
> +		ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
>  		break;
>  	case TPS6105X_MODE_TORCH_FLASH:
> -		tps6105x_cells[0].name = "tps6105x-flash";
> -		dev_warn(&client->dev,
> -			 "flash mode is unsupported\n");
> +		ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
>  		break;
>  	case TPS6105X_MODE_VOLTAGE:
> -		tps6105x_cells[0].name ="tps6105x-regulator";
> +		ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
>  		break;
>  	default:
> +		dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
>  		break;
>  	}
>  
> -	/* Set up and register the platform devices. */
> -	for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
> -		/* One state holder for all drivers, this is simple */
> -		tps6105x_cells[i].platform_data = tps6105x;
> -		tps6105x_cells[i].pdata_size = sizeof(*tps6105x);
> -	}
> +	if (ret)
> +		mfd_remove_devices(&client->dev);
>  
> -	return mfd_add_devices(&client->dev, 0, tps6105x_cells,
> -			       ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL);
> +	return ret;
>  }
>  
>  static int tps6105x_remove(struct i2c_client *client)

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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