Messages in this thread Patch in this message | | | Subject | [PATCH 1/2] backlight: lp855x_bl: Checking platform data in lp855x_probe | From | Axel Lin <> | Date | Thu, 02 Feb 2012 16:12:13 +0800 |
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The reset of the code assumes pdata is not NULL. Add checking for pdata in lp855x_probe, this prevents NULL dereference if pdata is NULL.
Signed-off-by: Axel Lin <axel.lin@gmail.com> --- drivers/video/backlight/lp855x_bl.c | 8 +++++++- 1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c index 8f628b8..5ab9ec8 100644 --- a/drivers/video/backlight/lp855x_bl.c +++ b/drivers/video/backlight/lp855x_bl.c @@ -230,9 +230,14 @@ static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id) { struct lp855x *lp; struct lp855x_platform_data *pdata = cl->dev.platform_data; - enum lp855x_brightness_ctrl_mode mode = pdata->mode; + enum lp855x_brightness_ctrl_mode mode; int ret; + if (!pdata) { + dev_err(&cl->dev, "no platform data supplied\n"); + return -EINVAL; + } + if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) return -EIO; @@ -240,6 +245,7 @@ static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id) if (!lp) return -ENOMEM; + mode = pdata->mode; lp->client = cl; lp->dev = &cl->dev; lp->pdata = pdata; -- 1.7.5.4
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