Re: [2.6 patch] isdn/gigaset/common.c: fix a memory leak

[Tilman Schmidt <tilman@imap.cc>]

Adrian Bunk wrote:

> This patch fixes a memory leak spotted by the Coverity checker
> if (!try_module_get(owner)).

Good catch. Thanks.

> Signed-off-by: Adrian Bunk <bunk@stusta.de>

Acked-by: Tilman Schmidt <tilman@imap.cc>

>
> ---
>
>  drivers/isdn/gigaset/common.c |   13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
>
> --- linux-2.6.17-rc1-mm1-full/drivers/isdn/gigaset/common.c.old	2006-04-04 19:45:19.000000000 +0200
> +++ linux-2.6.17-rc1-mm1-full/drivers/isdn/gigaset/common.c	2006-04-04 19:51:23.000000000 +0200
> @@ -1110,8 +1110,9 @@ struct gigaset_driver *gigaset_initdrive
>  	drv = kmalloc(sizeof *drv, GFP_KERNEL);
>  	if (!drv)
>  		return NULL;
> +
>  	if (!try_module_get(owner))
> -		return NULL;
> +		goto out1;
>
>  	drv->cs = NULL;
>  	drv->have_tty = 0;
> @@ -1125,10 +1126,11 @@ struct gigaset_driver *gigaset_initdrive
>
>  	drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL);
>  	if (!drv->cs)
> -		goto out1;
> +		goto out2;
> +
>  	drv->flags = kmalloc(minors * sizeof *drv->flags, GFP_KERNEL);
>  	if (!drv->flags)
> -		goto out2;
> +		goto out3;
>
>  	for (i = 0; i < minors; ++i) {
>  		drv->flags[i] = 0;
> @@ -1145,11 +1147,12 @@ struct gigaset_driver *gigaset_initdrive
>
>  	return drv;
>
> -out2:
> +out3:
>  	kfree(drv->cs);
> +out2:
> +	module_put(owner);
>  out1:
>  	kfree(drv);
> -	module_put(owner);
>  	return NULL;
>  }
>  EXPORT_SYMBOL_GPL(gigaset_initdriver);
>


--
Tilman Schmidt                    E-Mail: tilman@imap.cc
Bonn, Germany
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