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Harding" , Josh Poimboeuf , Jiri Kosina , Petr Mladek , Joe Lawrence , live-patching@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] livepatch: Fix kobject memleak Message-ID: <20190430104638.GA8137@kroah.com> References: <20190430001534.26246-1-tobin@kernel.org> <20190430001534.26246-2-tobin@kernel.org> <20190430084254.GB11737@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.4 (2019-03-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 30, 2019 at 12:44:55PM +0200, Miroslav Benes wrote: > 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 > > > > Reviewed-by: Greg Kroah-Hartman > > Well, it does not even compile... The idea is correct :) > 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 > > --- > > 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. Yeah, that makes it better, sorry for not catching that in the review :( greg k-h