linux-kernel - RE: [PATCH 4/4] drivers/net/wireless/mwifiex/scan.c: test the just-initialized value

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Message-ID: <477F20668A386D41ADCC57781B1F70430802DD7B8C@SC-VEXCH1.marvell.com>
Date:	Mon, 22 Aug 2011 12:29:23 -0700
From:	Bing Zhao <bzhao@...vell.com>
To:	"wharms@....de" <wharms@....de>
CC:	Julia Lawall <julia@...u.dk>,
	Pierre Louis Aublin <pierre-louis.aublin@...ia.fr>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	"John W. Linville" <linville@...driver.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 4/4] drivers/net/wireless/mwifiex/scan.c: test the
 just-initialized value

> Am 22.08.2011 21:02, schrieb Bing Zhao:
> > Hi Julia,
> >
> > Thanks for the patch.
> >
> >> -----Original Message-----
> >> From: Julia Lawall [mailto:julia@...u.dk]
> >> Sent: Monday, August 22, 2011 7:16 AM
> >> To: Pierre Louis Aublin
> >> Cc: Bing Zhao; kernel-janitors@...r.kernel.org; John W. Linville; linux-wireless@...r.kernel.org;
> >> netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> >> Subject: [PATCH 4/4] drivers/net/wireless/mwifiex/scan.c: test the just-initialized value
> >>
> >> From: Julia Lawall <julia@...u.dk>
> >>
> >> Test the just-initialized value rather than some other one.
> >>
> >> The semantic match that finds this problem is as follows:
> >> (http://coccinelle.lip6.fr/)
> >>
> >> // <smpl>
> >> @r@
> >> identifier x,y,f!={PTR_ERR,ERR_PTR,ERR_CAST};
> >> statement S;
> >> @@
> >>
> >> x = f(...);
> >> (
> >> if (\(x == NULL\|IS_ERR(x)\)) S
> >> |
> >> *if (\(y == NULL\|IS_ERR(y)\))
> >>  { ... when != x
> >>    return ...; }
> >> )
> >> // </smpl>
> >>
> >> Signed-off-by: Julia Lawall <julia@...u.dk>
> >
> > Acked-by: Bing Zhao <bzhao@...vell.com>
> >
> >
> > Thanks,
> > Bing
> >
> >>
> >> ---
> >>  drivers/net/wireless/mwifiex/scan.c |    4 ++--
> >>  1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
> >> index b28241c..37ca2f9 100644
> >> --- a/drivers/net/wireless/mwifiex/scan.c
> >> +++ b/drivers/net/wireless/mwifiex/scan.c
> >> @@ -1480,8 +1480,8 @@ mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
> >>  		return -ENOMEM;
> >>  	}
> >>  	beacon_ie = kzalloc(ie_len, GFP_KERNEL);
> >> -	if (!bss_desc) {
> >> -		dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
> >> +	if (!beacon_ie) {
> >> +		dev_err(priv->adapter->dev, " failed to alloc beacon_ie\n");
> >>  		return -ENOMEM;
> >>  	}
> >>  	memcpy(beacon_ie, ie_buf, ie_len);
> > --
> 
> 
> this looks like a case for kmemdup()

Hi Walter,

You are right. I believe there are some more cases where kmemdup can be used.

Hi John,

Please apply Julia's patch as I will send a separate patch later to address Walter's comment. Thanks.

> 
> just my 2 cents,

Thanks a lot for your 2 cents.

Bing

> 
> re,
>  wh
> 

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