linux-kernel - Re: [PATCH 6/10] drivers/net/wireless/iwlwifi: introduce missing kfree

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Message-ID: <Pine.LNX.4.64.0908031109020.8435@pc-004.diku.dk>
Date:	Mon, 3 Aug 2009 11:09:14 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Zhu Yi <yi.zhu@...el.com>
Cc:	"Chatre, Reinette" <reinette.chatre@...el.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"ipw3945-devel@...ts.sourceforge.net" 
	<ipw3945-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH 6/10] drivers/net/wireless/iwlwifi: introduce missing
 kfree

On Mon, 3 Aug 2009, Zhu Yi wrote:

> On Sat, 2009-08-01 at 16:54 +0800, 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/net/wireless/iwlwifi/iwl-debugfs.c     |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
> > index 7707a26..c2106d0 100644
> > --- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
> > +++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
> > @@ -320,6 +320,7 @@ static ssize_t iwl_dbgfs_nvm_read(struct file *file,
> >  	ptr = priv->eeprom;
> >  	if (!ptr) {
> >  		IWL_ERR(priv, "Invalid EEPROM/OTP memory\n");
> > +		kfree(buf);
> >  		return -ENOMEM;
> >  	}
> >  	pos += scnprintf(buf + pos, buf_size - pos, "NVM Type: %s\n",
> 
> Probably moving !priv->eeprom check prior to buf kzalloc is better.

OK, I will do that instead.

julia
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