In adp8870_bl_ambient_light_zone_store, set, clear, and write
can return an error but are not checked. The fix adds a check for these
cases and returns -1 to match the return type (ssize_t).
Signed-off-by: Aditya Pakki <[email protected]>
---
drivers/video/backlight/adp8870_bl.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
index 8d50e0299578..56a640587a82 100644
--- a/drivers/video/backlight/adp8870_bl.c
+++ b/drivers/video/backlight/adp8870_bl.c
@@ -800,10 +800,14 @@ static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
if (val == 0) {
/* Enable automatic ambient light sensing */
- adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
+ ret = adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
+ if (ret < 0)
+ goto adp8870_bl_err;
} else if ((val > 0) && (val < 6)) {
/* Disable automatic ambient light sensing */
- adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
+ ret = adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
+ if (ret < 0)
+ goto adp8870_bl_err;
/* Set user supplied ambient light zone */
mutex_lock(&data->lock);
@@ -811,12 +815,18 @@ static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
if (!ret) {
reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
reg_val |= (val - 1) << CFGR_BLV_SHIFT;
- adp8870_write(data->client, ADP8870_CFGR, reg_val);
+ ret = adp8870_write(data->client, ADP8870_CFGR,
+ reg_val);
}
mutex_unlock(&data->lock);
+ if (ret < 0)
+ goto adp8870_bl_err;
}
return count;
+
+adp8870_bl_err:
+ return -1;
}
static DEVICE_ATTR(ambient_light_zone, 0664,
adp8870_bl_ambient_light_zone_show,
--
2.17.1
On Sat, Jan 05, 2019 at 12:48:07PM -0600, Aditya Pakki wrote:
> In adp8870_bl_ambient_light_zone_store, set, clear, and write
I'm curious...
What attracted you to this particular _store function? AFAICT the same
ignoring of return values occurs in other _store functions in this file?
> can return an error but are not checked. The fix adds a check for these
> cases and returns -1 to match the return type (ssize_t).
This isn't right. The caller of the store function expects -errno
values (this is the default for almost all kernel functions).
> Signed-off-by: Aditya Pakki <[email protected]>
> ---
> drivers/video/backlight/adp8870_bl.c | 16 +++++++++++++---
> 1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
> index 8d50e0299578..56a640587a82 100644
> --- a/drivers/video/backlight/adp8870_bl.c
> +++ b/drivers/video/backlight/adp8870_bl.c
> @@ -800,10 +800,14 @@ static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
>
> if (val == 0) {
> /* Enable automatic ambient light sensing */
> - adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
> + ret = adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
> + if (ret < 0)
> + goto adp8870_bl_err;
There's nothing *wrong* with goto for error handling but is it
really needed here (there is no recovery code)?
> } else if ((val > 0) && (val < 6)) {
> /* Disable automatic ambient light sensing */
> - adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
> + ret = adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
> + if (ret < 0)
> + goto adp8870_bl_err;
+1
>
> /* Set user supplied ambient light zone */
> mutex_lock(&data->lock);
> @@ -811,12 +815,18 @@ static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
> if (!ret) {
> reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
> reg_val |= (val - 1) << CFGR_BLV_SHIFT;
> - adp8870_write(data->client, ADP8870_CFGR, reg_val);
> + ret = adp8870_write(data->client, ADP8870_CFGR,
> + reg_val);
> }
> mutex_unlock(&data->lock);
> + if (ret < 0)
> + goto adp8870_bl_err;
+1
Daniel.
> }
>
> return count;
> +
> +adp8870_bl_err:
> + return -1;
> }
> static DEVICE_ATTR(ambient_light_zone, 0664,
> adp8870_bl_ambient_light_zone_show,
> --
> 2.17.1
>
On Sat, Jan 05, 2019 at 12:48:07PM -0600, Aditya Pakki wrote:
> In adp8870_bl_ambient_light_zone_store, set, clear, and write
> can return an error but are not checked. The fix adds a check for these
> cases and returns -1 to match the return type (ssize_t).
Sorry... missed this before but there is also a typo in the Subject:
line.
Daniel.
>
> Signed-off-by: Aditya Pakki <[email protected]>
> ---
> drivers/video/backlight/adp8870_bl.c | 16 +++++++++++++---
> 1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
> index 8d50e0299578..56a640587a82 100644
> --- a/drivers/video/backlight/adp8870_bl.c
> +++ b/drivers/video/backlight/adp8870_bl.c
> @@ -800,10 +800,14 @@ static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
>
> if (val == 0) {
> /* Enable automatic ambient light sensing */
> - adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
> + ret = adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
> + if (ret < 0)
> + goto adp8870_bl_err;
> } else if ((val > 0) && (val < 6)) {
> /* Disable automatic ambient light sensing */
> - adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
> + ret = adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
> + if (ret < 0)
> + goto adp8870_bl_err;
>
> /* Set user supplied ambient light zone */
> mutex_lock(&data->lock);
> @@ -811,12 +815,18 @@ static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
> if (!ret) {
> reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
> reg_val |= (val - 1) << CFGR_BLV_SHIFT;
> - adp8870_write(data->client, ADP8870_CFGR, reg_val);
> + ret = adp8870_write(data->client, ADP8870_CFGR,
> + reg_val);
> }
> mutex_unlock(&data->lock);
> + if (ret < 0)
> + goto adp8870_bl_err;
> }
>
> return count;
> +
> +adp8870_bl_err:
> + return -1;
> }
> static DEVICE_ATTR(ambient_light_zone, 0664,
> adp8870_bl_ambient_light_zone_show,
> --
> 2.17.1
>