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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Message-ID: <54C0F59B.8090709@acm.org>
Date:	Thu, 22 Jan 2015 07:05:31 -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

Patch is queued for 3.20.  Thanks.

-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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