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>
---
drivers/usb/typec/altmodes/displayport.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index ef12b15bd484..9a637c2b4460 100644
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -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;
@@ -362,6 +364,7 @@ configuration_store(struct device *dev, struct device_attribute *attr,
}
dp->data.conf = conf;
+ ret = 0;
err_unlock:
mutex_unlock(&dp->lock);
--
2.17.1
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