linux-kernel - Re: [PATCH 7/10] drivers/hid: introduce missing kfree

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Date:	Sat, 8 Aug 2009 02:26:48 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Julia Lawall <julia@...u.dk>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 7/10] drivers/hid: introduce missing kfree

On Sat, 1 Aug 2009, Julia Lawall wrote:

> From: Julia Lawall <julia@...u.dk>
> 
> Error handling code following a kzalloc should free the allocated data.
> 
> The semantic match that finds the problem is as follows:
> (http://www.emn.fr/x-info/coccinelle/)
> 
> // <smpl>
> @r exists@
> local idexpression x;
> statement S;
> expression E;
> identifier f,f1,l;
> position p1,p2;
> expression *ptr != NULL;
> @@
> 
> x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
> ...
> if (x == NULL) S
> <... when != x
>      when != if (...) { <+...x...+> }
> (
> x->f1 = E
> |
>  (x->f1 == NULL || ...)
> |
>  f(...,x->f1,...)
> )
> ...>
> (
>  return \(0\|<+...x...+>\|ptr\);
> |
>  return@p2 ...;
> )
> 
> @script:python@
> p1 << r.p1;
> p2 << r.p2;
> @@
> 
> print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> ---
>  drivers/hid/hid-debug.c             |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
> index 3e425f7..6abd036 100644
> --- a/drivers/hid/hid-debug.c
> +++ b/drivers/hid/hid-debug.c
> @@ -928,6 +928,7 @@ static int hid_debug_events_open(struct inode *inode, struct file *file)
>  
>  	if (!(list->hid_debug_buf = kzalloc(sizeof(char) * HID_DEBUG_BUFSIZE, GFP_KERNEL))) {
>  		err = -ENOMEM;
> +		kfree(list);
>  		goto out;
>  	}
>  	list->hdev = (struct hid_device *) inode->i_private;
> 

Applied, thanks a lot Julia.

-- 
Jiri Kosina
SUSE Labs
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