On Thu, Jul 05, 2018 at 02:36:47PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> One of the error handling paths forgets to unlock dp->lock on the error
> exit path leading to a potential lock-up. Also the return path for a
> successful call to the function configuration_store can return an
> uninitialized error return code if dp->alt->active is false, so ensure
> ret is zeroed on the successful exit path to avoid garbage being returned.
>
> Detected by CoverityScan, CID#1471597 ("Unitialized scalar variable")
>
> Fixes: 0e3bb7d6894d ("usb: typec: Add driver for DisplayPort alternate mode")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Acked-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
>
> V2: move the ret = 0 assignment to the declaration
>
> ---
> drivers/usb/typec/altmodes/displayport.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
> index ef12b15bd484..3f06e94771a7 100644
> --- a/drivers/usb/typec/altmodes/displayport.c
> +++ b/drivers/usb/typec/altmodes/displayport.c
> @@ -333,7 +333,7 @@ configuration_store(struct device *dev, struct device_attribute *attr,
> u32 conf;
> u32 cap;
> int con;
> - int ret;
> + int ret = 0;
>
> con = sysfs_match_string(configurations, buf);
> if (con < 0)
> @@ -349,8 +349,10 @@ configuration_store(struct device *dev, struct device_attribute *attr,
> cap = DP_CAP_CAPABILITY(dp->alt->vdo);
>
> if ((con == DP_CONF_DFP_D && !(cap & DP_CAP_DFP_D)) ||
> - (con == DP_CONF_UFP_D && !(cap & DP_CAP_UFP_D)))
> - return -EINVAL;
> + (con == DP_CONF_UFP_D && !(cap & DP_CAP_UFP_D))) {
> + ret = -EINVAL;
> + goto err_unlock;
> + }
>
> conf = dp->data.conf & ~DP_CONF_DUAL_D;
> conf |= con;
Thanks,
--
heikki
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