linux-kernel - Re: [PATCH RESEND] char:ipmi: Free ipmi_recv_msg messages from the linked list,recv_msgs for the function,ipmi_release in the file,ipmi

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Date:	Fri, 23 Jan 2015 11:07:01 -0600
From:	Corey Minyard <minyard@....org>
To:	nick <xerofoify@...il.com>, Sasha Levin <sasha.levin@...cle.com>
CC:	openipmi-developer@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] char:ipmi: Free ipmi_recv_msg messages from the
 linked list,recv_msgs for the function,ipmi_release in the file,ipmi_devintf.c

On 01/23/2015 10:35 AM, nick wrote:
> Sasha,
> How is this patch broken? It builds and clearly frees 
> the list entries. Please explain how to me.
> Nick

Oh, it does not free priv.  That code should not have been removed.

-corey

> On 2015-01-22 11:50 PM, Sasha Levin wrote:
>> On 01/22/2015 08:05 AM, Corey Minyard wrote:
>>> Patch is queued for 3.20.  Thanks.
>> That patch is horribly broken.
>>
>>
>> Thanks,
>> Sasha
>>
>>> -corey
>>>
>>> On 01/19/2015 09:14 PM, Nicholas Krause wrote:
>>>> This adds a loop through the elements in the linked list, recv_msgs using
>>>> list_for_entry_safe in order to free messages in this list.  In addition
>>>> we are using the safe version of this marco in order to prevent use after
>>>> bugs related to deleting the element we are on currently by holding a
>>>> pointer to the next element after the current one we are on and freeing
>>>> with the function, ipmi_free_recv_msg internally in this loop.
>>>>
>>>> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
>>>> ---
>>>>  drivers/char/ipmi/ipmi_devintf.c | 7 ++++---
>>>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/char/ipmi/ipmi_devintf.c b/drivers/char/ipmi/ipmi_devintf.c
>>>> index ec318bf..d2af38a 100644
>>>> --- a/drivers/char/ipmi/ipmi_devintf.c
>>>> +++ b/drivers/char/ipmi/ipmi_devintf.c
>>>> @@ -157,14 +157,15 @@ static int ipmi_release(struct inode *inode, struct file *file)
>>>>  {
>>>>  	struct ipmi_file_private *priv = file->private_data;
>>>>  	int                      rv;
>>>> +	struct  ipmi_recv_msg *msg, *next;
>>>>  
>>>>  	rv = ipmi_destroy_user(priv->user);
>>>>  	if (rv)
>>>>  		return rv;
>>>>  
>>>> -	/* FIXME - free the messages in the list. */
>>>> -	kfree(priv);
>>>> -
>>>> +	list_for_each_entry_safe(msg, next, &priv->recv_msgs, link) {
>>>> +		ipmi_free_recv_msg(msg);
>>>> +	}
>>>>  	return 0;
>>>>  }
>>>>  
>>> --
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