[RFC PATCH 1/5] livepatch: Fix kobject memleak

[Tobin C. Harding]

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 <to...@kernel.org>
---
 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..98295de2172b 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(&obj->kobj);
                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(&patch->kobj);
                return ret;
+       }
        patch->kobj_added = true;
 
        if (patch->replace) {
-- 
2.21.0