linux-kernel - Re: [PATCH] staging: wilc1000: check for kmalloc allocation failures

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Date:   Mon, 26 Mar 2018 17:15:53 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Ajay Singh <ajay.kathat@...rochip.com>
Cc:     Joe Perches <joe@...ches.com>,
        Aditya Shankar <aditya.shankar@...rochip.com>,
        Ganesh Krishna <ganesh.krishna@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-wireless@...r.kernel.org, devel@...verdev.osuosl.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: wilc1000: check for kmalloc allocation failures

On 26/03/18 16:35, Ajay Singh wrote:
> Thanks for submitting the patch.
> 
> On Wed, 21 Mar 2018 13:03:18 -0700
> Joe Perches <joe@...ches.com> wrote:
> 
>> On Wed, 2018-03-21 at 19:19 +0000, Colin King wrote:
>>> From: Colin Ian King <colin.king@...onical.com>
>>>
>>> There are three kmalloc allocations that are not null checked which
>>> potentially could lead to null pointer dereference issues. Fix this
>>> by adding null pointer return checks.
>>
>> looks like all of these should be kmemdup or kstrdup
>>
>>>  
>>> @@ -951,6 +955,10 @@ static s32 handle_connect(struct wilc_vif *vif,
>>>  	if (conn_attr->ssid) {
>>>  		hif_drv->usr_conn_req.ssid = kmalloc(conn_attr->ssid_len + 1,
>>>  						     GFP_KERNEL);
>>> +		if (!hif_drv->usr_conn_req.ssid) {
>>> +			result = -ENOMEM;
>>> +			goto error;
>>> +		}
>>>  		memcpy(hif_drv->usr_conn_req.ssid,
>>>  		       conn_attr->ssid,
>>>  		       conn_attr->ssid_len);
> 
> With this changes the Coverity reported warning is handled correctly.
> 
> For further improvement to the patch, as Joe Perches suggested, its better
> to make use of kmemdup instead of kmalloc & memcpy. As kstrdup requires the
> source string to be NULL terminated('\0') and conn_attr->ssid might not  
> contains the '\0' terminated string. So kmemdup with length of 
> 'conn_attr->ssid_len' can be used instead.
> 
> Please include the changes by using kmemdup() for all kmalloc/memcpy in
> this patch.

The original has been included into Greg's staging repo, so I'll send a
send patch that addresses the kmemdup.

Colin
> 
> 
> 
> Regards,
> Ajay
>