From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C40F7C43219 for ; Tue, 30 Apr 2019 10:46:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 92B6920675 for ; Tue, 30 Apr 2019 10:46:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556621203; bh=D3sfDG7uxYtxPW02ApZZJFjnsJg3kMpIBjXi36/qpno=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=0DKAGnbLZonWa73wd+8Xp2ptdqdFEQk+qJjwjS9Z0PEEFmhUipNZFnGrKH3Kbadi9 T0uaT9q85THw/BrFuFjUG9gxuqDvBNTat3oNnATSXsbefXZFgusqSQGQMxt+dXGkYL kzFyP/RiA0AgKt7JBv4T3lpio5tTRMOpKQSrkR7I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727205AbfD3Kqm (ORCPT ); Tue, 30 Apr 2019 06:46:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:50496 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726736AbfD3Kql (ORCPT ); Tue, 30 Apr 2019 06:46:41 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C048E20675; Tue, 30 Apr 2019 10:46:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556621201; bh=D3sfDG7uxYtxPW02ApZZJFjnsJg3kMpIBjXi36/qpno=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ChJUZQJwe1XcML0+wkCvqsopVCkLe5hjyK/1ECif/g6SLfTtVah03jseseraLfs+I 16ipOq+lLYd/SruQpfU1YH04tKiAz1KJsCIySGy8dfEPU+YkIuR7OZoi/D2V1obGMD yHBwa6YyFXLg4bVfE+x1nfz9vectIJs3tW0CwtS4= Date: Tue, 30 Apr 2019 12:46:38 +0200 From: Greg Kroah-Hartman To: Miroslav Benes Cc: "Tobin C. 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