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iio: chemical: vz89x: prevent corrupted buffer from being read

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Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Matt Ranostay 2016-08-24 23:44:49 -07:00 committed by Jonathan Cameron
parent 0a735aa07f
commit 9d1894cd19
1 changed files with 6 additions and 2 deletions
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8
drivers/iio/chemical/vz89x.c
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@ -55,6 +55,7 @@ struct vz89x_data {
struct mutex lock;
int (*xfer)(struct vz89x_data *data, u8 cmd);
bool is_valid;
unsigned long last_update;
u8 buffer[VZ89TE_REG_MEASUREMENT_RD_SIZE];
};
@ -229,7 +230,10 @@ static int vz89x_get_measurement(struct vz89x_data *data)
/* sensor can only be polled once a second max per datasheet */
if (!time_after(jiffies, data->last_update + HZ))
return 0;
return data->is_valid ? 0 : -EAGAIN;
data->is_valid = false;
data->last_update = jiffies;
ret = data->xfer(data, chip->cmd);
if (ret < 0)
@ -239,7 +243,7 @@ static int vz89x_get_measurement(struct vz89x_data *data)
if (ret)
return -EAGAIN;
data->last_update = jiffies;
data->is_valid = true;
return 0;
}