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

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Date:   Wed, 27 Mar 2019 19:27:30 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Colin Ian King <colin.king@...onical.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: u132-hcd: fix potential NULL pointer dereference

Please change the patch version in subject while sending patch.

On 3/26/2019 10:11 AM, Greg Kroah-Hartman wrote:
> On Tue, Mar 19, 2019 at 12:34:06PM -0500, Kangjie Lu wrote:
>> 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>


Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>

-Mukesh

>> ---
>> removed "unlikely"
>> ---
>>   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 (!workqueue)
>> +		return -ENOMEM;
>>   	retval = platform_driver_register(&u132_platform_driver);
>>   	return retval;
> if platform_driver_register() fails, shouldn't you clean up the
> workqueue?  That can be a separate patch, that's not your fault here :)

I have taken care of it.

https://lore.kernel.org/patchwork/patch/1054800/



>
> thanks,
>
> greg k-h