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:	Wed, 04 Feb 2015 14:17:15 -0600
From:	Corey Minyard <minyard@....org>
To:	Nicholas Krause <xerofoify@...il.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

I've been debating what to do with this, but the patch makes a good
change, so
I'll go ahead with it.  I am going to remove the unnecessary braces.

In the future, you really need to be able to test the changes you make. 
So you really
need to work in an area that you can test in.  If you are really
interested in learning,
you have a ways to go, I think, and the kernel may not be the best place
to do that
learning.

-corey

On 01/30/2015 11:17 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, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/ipmi/ipmi_devintf.c b/drivers/char/ipmi/ipmi_devintf.c
> index ec318bf..235a1fa 100644
> --- a/drivers/char/ipmi/ipmi_devintf.c
> +++ b/drivers/char/ipmi/ipmi_devintf.c
> @@ -157,12 +157,17 @@ 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. */
> +	list_for_each_entry_safe(msg, next, &priv->recv_msgs, link) {
> +		ipmi_free_recv_msg(msg);
> +	}
> +
> +
>  	kfree(priv);
>  
>  	return 0;

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