HID: logitech: check the return value of create_singlethread_workqueue

BugLink: https://bugs.launchpad.net/bugs/1838459
[ Upstream commit 6c44b15e1c9076d925d5236ddadf1318b0a25ce2 ]

create_singlethread_workqueue may fail and return NULL. The fix checks if it is
NULL to avoid NULL pointer dereference.  Also, the fix moves the call of
create_singlethread_workqueue earlier to avoid resource-release issues.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 19cc980eebce6a3019c44d55dcbef0002e1cda10..8425d3548a4141113a793326ef3c6a56974e4e30 100644 (file)
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -1907,6 +1907,13 @@ static int hidpp_ff_init(struct hidpp_device *hidpp, u8 feature_index)
                kfree(data);
                return -ENOMEM;
        }
+       data->wq = create_singlethread_workqueue("hidpp-ff-sendqueue");
+       if (!data->wq) {
+               kfree(data->effect_ids);
+               kfree(data);
+               return -ENOMEM;
+       }
+
        data->hidpp = hidpp;
        data->feature_index = feature_index;
        data->version = version;
@@ -1951,7 +1958,6 @@ static int hidpp_ff_init(struct hidpp_device *hidpp, u8 feature_index)
        /* ignore boost value at response.fap.params[2] */
 
        /* init the hardware command queue */
-       data->wq = create_singlethread_workqueue("hidpp-ff-sendqueue");
        atomic_set(&data->workqueue_size, 0);
 
        /* initialize with zero autocenter to get wheel in usable state */