hwmon: (max1111) Fix race condition causing NULL pointer exception

spi_sync call uses its spi_message parameter to keep completion information,
using a drvdata structure is not thread-safe. Use a mutex to prevent
multiple access to shared driver data.

Signed-off-by: Pavel Herrmann <morpheus.ibis@gmail.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Cyril Hrubis <metan@ucw.cz>
Tested-by: Stanislav Brabec <utx@penguin.cz>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: stable@kernel.org

diff --git a/drivers/hwmon/max1111.c b/drivers/hwmon/max1111.c
index 12a54aa..14335bb 100644 (file)
--- a/drivers/hwmon/max1111.c
+++ b/drivers/hwmon/max1111.c
@@ -40,6 +40,8 @@ struct max1111_data {
        struct spi_transfer     xfer[2];
        uint8_t *tx_buf;
        uint8_t *rx_buf;
+       struct mutex            drvdata_lock;
+       /* protect msg, xfer and buffers from multiple access */
 };
 
 static int max1111_read(struct device *dev, int channel)
@@ -48,6 +50,9 @@ static int max1111_read(struct device *dev, int channel)
        uint8_t v1, v2;
        int err;
 
+       /* writing to drvdata struct is not thread safe, wait on mutex */
+       mutex_lock(&data->drvdata_lock);
+
        data->tx_buf[0] = (channel << MAX1111_CTRL_SEL_SH) |
                MAX1111_CTRL_PD0 | MAX1111_CTRL_PD1 |
                MAX1111_CTRL_SGL | MAX1111_CTRL_UNI | MAX1111_CTRL_STR;
@@ -55,12 +60,15 @@ static int max1111_read(struct device *dev, int channel)
        err = spi_sync(data->spi, &data->msg);
        if (err < 0) {
                dev_err(dev, "spi_sync failed with %d\n", err);
+               mutex_unlock(&data->drvdata_lock);
                return err;
        }
 
        v1 = data->rx_buf[0];
        v2 = data->rx_buf[1];
 
+       mutex_unlock(&data->drvdata_lock);
+
        if ((v1 & 0xc0) || (v2 & 0x3f))
                return -EINVAL;
 
@@ -176,6 +184,8 @@ static int __devinit max1111_probe(struct spi_device *spi)
        if (err)
                goto err_free_data;
 
+       mutex_init(&data->drvdata_lock);
+
        data->spi = spi;
        spi_set_drvdata(spi, data);
 
@@ -213,6 +223,7 @@ static int __devexit max1111_remove(struct spi_device *spi)
 
        hwmon_device_unregister(data->hwmon_dev);
        sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
+       mutex_destroy(&data->drvdata_lock);
        kfree(data->rx_buf);
        kfree(data->tx_buf);
        kfree(data);