linux-kernel - [PATCH] usb: u132-hcd: fix potential NULL pointer dereference

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Message-Id: <20190314072713.20666-1-kjlu@umn.edu>
Date:   Thu, 14 Mar 2019 02:27:11 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Colin Ian King <colin.king@...onical.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] usb: u132-hcd: fix potential NULL pointer dereference

In case create_singlethread_workqueue fails, the fix notifies
callers the error to avoid potential NULL pointer dereferences.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/usb/host/u132-hcd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/host/u132-hcd.c b/drivers/usb/host/u132-hcd.c
index 934584f0a20a..6d5b532b03f8 100644
--- a/drivers/usb/host/u132-hcd.c
+++ b/drivers/usb/host/u132-hcd.c
@@ -3203,6 +3203,8 @@ static int __init u132_hcd_init(void)
 		return -ENODEV;
 	printk(KERN_INFO "driver %s\n", hcd_name);
 	workqueue = create_singlethread_workqueue("u132");
+	if (unlikely(!workqueue))
+		return -ENOMEM;
 	retval = platform_driver_register(&u132_platform_driver);
 	return retval;
 }
-- 
2.17.1