Re: [PATCH 11/16] target: plug memory leak

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On Wed, 17 September 2014 14:32:13 -0700, Nicholas A. Bellinger wrote:
> On Tue, 2014-09-02 at 17:49 -0400, Joern Engel wrote:
> > Found by coverity.
> > 
> > Signed-off-by: Joern Engel <joern@xxxxxxxxx>
> > ---
> >  drivers/target/target_core_fabric_configfs.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/target/target_core_fabric_configfs.c b/drivers/target/target_core_fabric_configfs.c
> > index 7de9f0475d05..376d1dfb2fdf 100644
> > --- a/drivers/target/target_core_fabric_configfs.c
> > +++ b/drivers/target/target_core_fabric_configfs.c
> > @@ -320,7 +320,7 @@ static struct config_group *target_fabric_make_mappedlun(
> >  			struct se_node_acl, acl_group);
> >  	struct se_portal_group *se_tpg = se_nacl->se_tpg;
> >  	struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
> > -	struct se_lun_acl *lacl;
> > +	struct se_lun_acl *lacl = NULL;
> >  	struct config_item *acl_ci;
> >  	struct config_group *lacl_cg = NULL, *ml_stat_grp = NULL;
> >  	char *buf;
> > @@ -404,6 +404,7 @@ static struct config_group *target_fabric_make_mappedlun(
> >  	kfree(buf);
> >  	return &lacl->se_lun_group;
> >  out:
> > +	kfree(lacl);
> >  	if (lacl_cg)
> >  		kfree(lacl_cg->default_groups);
> >  	kfree(buf);
> 
> This is not right, due to lacl_cg memory reference after first releasing
> lacl.
> 
> Just to be safe, fixing up the ordering and squashing into the original
> below.

Indeed!  Thanks for catching it!

> diff --git a/drivers/target/target_core_fabric_configfs.c b/drivers/target/target_core_fabric
> index 7228a18..0638a67 100644
> --- a/drivers/target/target_core_fabric_configfs.c
> +++ b/drivers/target/target_core_fabric_configfs.c
> @@ -320,7 +320,7 @@ static struct config_group *target_fabric_make_mappedlun(
>                         struct se_node_acl, acl_group);
>         struct se_portal_group *se_tpg = se_nacl->se_tpg;
>         struct target_fabric_configfs *tf = se_tpg->se_tpg_wwn->wwn_tf;
> -       struct se_lun_acl *lacl;
> +       struct se_lun_acl *lacl = NULL;
>         struct config_item *acl_ci;
>         struct config_group *lacl_cg = NULL, *ml_stat_grp = NULL;
>         char *buf;
> @@ -406,6 +406,7 @@ static struct config_group *target_fabric_make_mappedlun(
>  out:
>         if (lacl_cg)
>                 kfree(lacl_cg->default_groups);
> +       kfree(lacl);
>         kfree(buf);
>         return ERR_PTR(ret);
> 
> 

Jörn

--
Data expands to fill the space available for storage.
-- Parkinson's Law
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