On Tue, 30 Apr 2019, Greg Kroah-Hartman wrote:
> On Tue, Apr 30, 2019 at 10:15:33AM +1000, Tobin C. Harding wrote:
> > Currently error return from kobject_init_and_add() is not followed by a
> > call to kobject_put(). This means there is a memory leak.
> >
> > Add call to kobject_put() in error path of kobject_init_and_add().
> >
> > Signed-off-by: Tobin C. Harding <tobin@xxxxxxxxxx>
>
> Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Well, it does not even compile...
On Tue, 30 Apr 2019, Tobin C. Harding wrote:
> Currently error return from kobject_init_and_add() is not followed by a
> call to kobject_put(). This means there is a memory leak.
>
> Add call to kobject_put() in error path of kobject_init_and_add().
>
> Signed-off-by: Tobin C. Harding <tobin@xxxxxxxxxx>
> ---
> kernel/livepatch/core.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
> index eb0ee10a1981..98a7bec41faa 100644
> --- a/kernel/livepatch/core.c
> +++ b/kernel/livepatch/core.c
> @@ -727,7 +727,9 @@ static int klp_init_func(struct klp_object *obj, struct klp_func *func)
> ret = kobject_init_and_add(&func->kobj, &klp_ktype_func,
> &obj->kobj, "%s,%lu", func->old_name,
> func->old_sympos ? func->old_sympos : 1);
> - if (!ret)
> + if (ret)
> + kobject_put(&func->kobj);
> + else
> func->kobj_added = true;
>
> return ret;
> @@ -803,8 +805,10 @@ static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)
> name = klp_is_module(obj) ? obj->name : "vmlinux";
> ret = kobject_init_and_add(&obj->kobj, &klp_ktype_object,
> &patch->kobj, "%s", name);
> - if (ret)
> + if (ret) {
> + kobject_put(&func->kobj);
kobject_put(&obj->kobj); I suppose.
> return ret;
> + }
> obj->kobj_added = true;
>
> klp_for_each_func(obj, func) {
> @@ -862,8 +866,10 @@ static int klp_init_patch(struct klp_patch *patch)
>
> ret = kobject_init_and_add(&patch->kobj, &klp_ktype_patch,
> klp_root_kobj, "%s", patch->mod->name);
> - if (ret)
> + if (ret) {
> + kobject_put(&func->kobj);
kobject_put(&patch->kobj);
Thanks,
Miroslav
