diff mbox

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

Message ID 1314021636-11528-4-git-send-email-julia@diku.dk
State Not Applicable, archived
Delegated to: David Miller
Headers show

Commit Message

Julia Lawall Aug. 22, 2011, 2 p.m. UTC
From: Julia Lawall <julia@diku.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@diku.dk>

---
 drivers/net/wireless/mwifiex/scan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Comments

Pierre Louis Aublin Aug. 22, 2011, 2:11 p.m. UTC | #1
Hello all

On 08/22/2011 04:00 PM, Julia Lawall wrote:
> -	if (!bss_desc) {
> +	if (!beacon_ie) {
>   		dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
Shouldn't we also modify the error message, from "failed to alloc 
bss_desc" to "failed to alloc beacon_ie" ?

Sincerely
Pierre Louis Aublin
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Julia Lawall Aug. 22, 2011, 2:12 p.m. UTC | #2
On Mon, 22 Aug 2011, Pierre Louis Aublin wrote:

> Hello all
> 
> On 08/22/2011 04:00 PM, Julia Lawall wrote:
> > -	if (!bss_desc) {
> > +	if (!beacon_ie) {
> >     dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
> Shouldn't we also modify the error message, from "failed to alloc bss_desc" to
> "failed to alloc beacon_ie" ?

Sure :)

julia
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Larry Finger Aug. 22, 2011, 3:19 p.m. UTC | #3
On 08/22/2011 09:00 AM, Julia Lawall wrote:
> From: Julia Lawall<julia@diku.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@diku.dk>
>
> ---
>   drivers/net/wireless/mwifiex/scan.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
> index b28241c..d3111c9 100644
> --- a/drivers/net/wireless/mwifiex/scan.c
> +++ b/drivers/net/wireless/mwifiex/scan.c
> @@ -1480,7 +1480,7 @@ mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
>   		return -ENOMEM;
>   	}
>   	beacon_ie = kzalloc(ie_len, GFP_KERNEL);
> -	if (!bss_desc) {
> +	if (!beacon_ie) {
>   		dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
>   		return -ENOMEM;
>   	}

The error message should also get the bss_desc => beacon_ie chang.

Larry
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Julia Lawall Aug. 22, 2011, 3:28 p.m. UTC | #4
On Mon, 22 Aug 2011, Larry Finger wrote:

> On 08/22/2011 09:00 AM, Julia Lawall wrote:
> > From: Julia Lawall<julia@diku.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@diku.dk>
> >
> > ---
> >   drivers/net/wireless/mwifiex/scan.c |    2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/wireless/mwifiex/scan.c
> > b/drivers/net/wireless/mwifiex/scan.c
> > index b28241c..d3111c9 100644
> > --- a/drivers/net/wireless/mwifiex/scan.c
> > +++ b/drivers/net/wireless/mwifiex/scan.c
> > @@ -1480,7 +1480,7 @@ mwifiex_update_curr_bss_params(struct mwifiex_private
> > *priv,
> >    	return -ENOMEM;
> >    }
> >    beacon_ie = kzalloc(ie_len, GFP_KERNEL);
> > -	if (!bss_desc) {
> > +	if (!beacon_ie) {
> >     dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
> >     return -ENOMEM;
> >    }
> 
> The error message should also get the bss_desc => beacon_ie chang.

Thanks.  Pierre Louis Aublin made the same observation and I resumitted 
the patch.

julia
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
index b28241c..d3111c9 100644
--- a/drivers/net/wireless/mwifiex/scan.c
+++ b/drivers/net/wireless/mwifiex/scan.c
@@ -1480,7 +1480,7 @@  mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
 		return -ENOMEM;
 	}
 	beacon_ie = kzalloc(ie_len, GFP_KERNEL);
-	if (!bss_desc) {
+	if (!beacon_ie) {
 		dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
 		return -ENOMEM;
 	}