From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A91102C2374; Mon, 23 Mar 2026 17:57:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774288668; cv=none; b=Ozhh++NKLDR0Y/PCMzYUyeeUGvRjqJQuWcp62Yc0RT3/G2Rxu0f0qoALFYrAJhFIfg/BV5+kpbXQiLsF8jjgWQ7uvM305okyN0D1Exzk0ImgowxhE/299b+prmsTHtmxjj535rXeSve3i7P9TZOpXI/lr/+WcRh71wndckMhPkg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774288668; c=relaxed/simple; bh=llAqm9jUFzuOndiDK/Pj1Otig2XXWSZX0s0xdJgEDBU=; h=Date:From:To:CC:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Bmv29ypgfbKYgNctgFbTh/52wCiMNHPwHKZTMuamWFKozxT3PcQ5fnJPgAW9MTCntKrxcNCQgi4VJU3rdBKbAz7xZ4hjqbNkuPtp8VBN/XoZHxPAxIGTWXBbKbqbiN/hCl+P1y5SjWJ6PXmmk+6af9BJeNQosOnb3MtyMDrx600= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.224.107]) by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4ffgqC4YhQzHnGcW; Tue, 24 Mar 2026 01:57:11 +0800 (CST) Received: from dubpeml500005.china.huawei.com (unknown [7.214.145.207]) by mail.maildlp.com (Postfix) with ESMTPS id 712B940584; Tue, 24 Mar 2026 01:57:43 +0800 (CST) Received: from localhost (10.203.177.15) by dubpeml500005.china.huawei.com (7.214.145.207) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Mon, 23 Mar 2026 17:57:42 +0000 Date: Mon, 23 Mar 2026 17:57:40 +0000 From: Jonathan Cameron To: Smita Koralahalli CC: , , , , , Ard Biesheuvel , "Alison Schofield" , Vishal Verma , Ira Weiny , Dan Williams , Yazen Ghannam , "Dave Jiang" , Davidlohr Bueso , "Matthew Wilcox" , Jan Kara , "Rafael J . Wysocki" , Len Brown , Pavel Machek , Li Ming , Jeff Johnson , Ying Huang , Yao Xingtao , "Peter Zijlstra" , Greg Kroah-Hartman , Nathan Fontenot , Terry Bowman , Robert Richter , Benjamin Cheatham , Zhijian Li , Borislav Petkov , Tomasz Wolski Subject: Re: [PATCH v8 1/9] dax/bus: Use dax_region_put() in alloc_dax_region() error path Message-ID: <20260323175740.000014c1@huawei.com> In-Reply-To: <20260322195343.206900-2-Smita.KoralahalliChannabasappa@amd.com> References: <20260322195343.206900-1-Smita.KoralahalliChannabasappa@amd.com> <20260322195343.206900-2-Smita.KoralahalliChannabasappa@amd.com> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: lhrpeml100010.china.huawei.com (7.191.174.197) To dubpeml500005.china.huawei.com (7.214.145.207) On Sun, 22 Mar 2026 19:53:34 +0000 Smita Koralahalli wrote: > alloc_dax_region() calls kref_init() on the dax_region early in the > function, but the error path for sysfs_create_groups() failure uses > kfree() directly to free the dax_region. This bypasses the kref lifecycle. > > Use dax_region_put() instead to handle kref lifecycle correctly. > > Suggested-by: Jonathan Cameron > Signed-off-by: Smita Koralahalli Reviewed-by: Jonathan Cameron > --- > drivers/dax/bus.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c > index c94c09622516..299134c9b294 100644 > --- a/drivers/dax/bus.c > +++ b/drivers/dax/bus.c > @@ -668,7 +668,7 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id, > }; > > if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) { > - kfree(dax_region); > + dax_region_put(dax_region); > return NULL; > } >