releases/5.0.14/hid-logitech-check-the-return-value-of-create_single.patch

From 69d429b6f8655ae37c6a0bbc3e63427d4ef4c79b Mon Sep 17 00:00:00 2001
From: Kangjie Lu <kjlu@umn.edu>
Date: Thu, 14 Mar 2019 00:24:02 -0500
Subject: HID: logitech: check the return value of
 create_singlethread_workqueue

[ 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 (Microsoft) <sashal@kernel.org>
---
 drivers/hid/hid-logitech-hidpp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index f040c8a7f9a9..199cc256e9d9 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -2111,6 +2111,13 @@ 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;
@@ -2155,7 +2162,6 @@ 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 */
-- 
2.20.1