[PATCH 3/10] drivers/media/video/gspca: introduce missing kfree

[PATCH 3/10] drivers/media/video/gspca: introduce missing kfree

[Julia Lawall]

From: Julia Lawall <julia@diku.dk>

Error handling code following a kmalloc 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@diku.dk>
---
 drivers/media/video/gspca/m5602/m5602_s5k83a.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/media/video/gspca/m5602/m5602_s5k83a.c b/drivers/media/video/gspca/m5602/m5602_s5k83a.c
index 7127321..6b89f33 100644
--- a/drivers/media/video/gspca/m5602/m5602_s5k83a.c
+++ b/drivers/media/video/gspca/m5602/m5602_s5k83a.c
@@ -178,8 +178,10 @@ sensor_found:
 
 	sens_priv->settings  	kmalloc(sizeof(s32)*ARRAY_SIZE(s5k83a_ctrls), GFP_KERNEL);
-	if (!sens_priv->settings)
+	if (!sens_priv->settings) {
+		kfree(sens_priv);
 		return -ENOMEM;
+	}
 
 	sd->gspca_dev.cam.cam_mode = s5k83a_modes;
 	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(s5k83a_modes);

Re: [PATCH 3/10] drivers/media/video/gspca: introduce missing kfree

[Erik Andrén]

Julia Lawall wrote:
> From: Julia Lawall <julia@diku.dk>
> 
> Error handling code following a kmalloc 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@diku.dk>

Acked-by: Erik Andrén <erik.andren@gmail.com>
> ---
>  drivers/media/video/gspca/m5602/m5602_s5k83a.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/media/video/gspca/m5602/m5602_s5k83a.c b/drivers/media/video/gspca/m5602/m5602_s5k83a.c
> index 7127321..6b89f33 100644
> --- a/drivers/media/video/gspca/m5602/m5602_s5k83a.c
> +++ b/drivers/media/video/gspca/m5602/m5602_s5k83a.c
> @@ -178,8 +178,10 @@ sensor_found:
>  
>  	sens_priv->settings >  	kmalloc(sizeof(s32)*ARRAY_SIZE(s5k83a_ctrls), GFP_KERNEL);
> -	if (!sens_priv->settings)
> +	if (!sens_priv->settings) {
> +		kfree(sens_priv);
>  		return -ENOMEM;
> +	}
>  
>  	sd->gspca_dev.cam.cam_mode = s5k83a_modes;
>  	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(s5k83a_modes);
> --

Is this patch already merged into a tree that will be merged in the
upstream one or should the v4l-dvb tree merge it?

Best regards,
Erik

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