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=-8.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 94851C35671 for ; Mon, 24 Feb 2020 13:00:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 50C0F2080D for ; Mon, 24 Feb 2020 13:00:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=gmx.net header.i=@gmx.net header.b="EJax5X05" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727429AbgBXNAu (ORCPT ); Mon, 24 Feb 2020 08:00:50 -0500 Received: from mout.gmx.net ([212.227.15.15]:38013 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727405AbgBXNAu (ORCPT ); Mon, 24 Feb 2020 08:00:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1582549244; bh=u9JJKVhyJ9Jp//SHhFK3pKdR4cdi9AHrgy+EUE4ND48=; h=X-UI-Sender-Class:Subject:To:References:From:Date:In-Reply-To; b=EJax5X05O00w8bkLF+wg3Nys1jVvRsoy6DaoLw582GMRysK2LeZyTDf9GwvuQAxRk kPSWqYf7Bc4If8ybLLkXSvp76LDZcCRfUszivc5vpuZ06FpTqMu7A//IMOTH7jxvNV aNxdevs3l1x3VM1j6TbXocPXT3ejZswK9aqntI6k= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from [0.0.0.0] ([149.28.201.231]) by mail.gmx.com (mrgmx004 [212.227.17.184]) with ESMTPSA (Nemesis) id 1M9o1v-1j2f6n0jDx-005tdU; Mon, 24 Feb 2020 14:00:44 +0100 Subject: Re: [PATCH] btrfs: Fix uninitialized ret in btrfsic_process_superblock_dev_mirror To: Nikolay Borisov , linux-btrfs@vger.kernel.org References: <20200224125628.27121-1-nborisov@suse.com> From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; prefer-encrypt=mutual; keydata= mQENBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAG0IlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT6JAU4EEwEIADgCGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCXZw1oQAKCRDC PZHzoSX+qCY6CACd+mWu3okGwRKXju6bou+7VkqCaHTdyXwWFTsr+/0ly5nUdDtT3yEVggPJ 3VP70wjlrxUjNjFb6iIvGYxiPOrop1NGwGYvQktgRhaIhALG6rPoSSAhGNjwGVRw0km0PlIN D29BTj/lYEk+jVM1YL0QLgAE1AI3krihg/lp/fQT53wLhR8YZIF8ETXbClQG1vJ0cllPuEEv efKxRyiTSjB+PsozSvYWhXsPeJ+KKjFen7ebE5reQTPFzSHctCdPnoR/4jSPlnTlnEvLeqcD ZTuKfQe1gWrPeevQzgCtgBF/WjIOeJs41klnYzC3DymuQlmFubss0jShLOW8eSOOWhLRuQEN BFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcgaCbPEwhLj 1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj/IrRUUka 68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fNGSsRb+pK EKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0q1eW4Jrv 0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEvABEBAAGJ ATwEGAEIACYCGwwWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCXZw1rgUJCWpOfwAKCRDCPZHz oSX+qFcEB/95cs8cM1OQdE/GgOfCGxwgckMeWyzOR7bkAWW0lDVp2hpgJuxBW/gyfmtBnUai fnggx3EE3ev8HTysZU9q0h+TJwwJKGv6sUc8qcTGFDtavnnl+r6xDUY7A6GvXEsSoCEEynby 72byGeSovfq/4AWGNPBG1L61Exl+gbqfvbECP3ziXnob009+z9I4qXodHSYINfAkZkA523JG ap12LndJeLk3gfWNZfXEWyGnuciRGbqESkhIRav8ootsCIops/SqXm0/k+Kcl4gGUO/iD/T5 oagaDh0QtOd8RWSMwLxwn8uIhpH84Q4X1LadJ5NCgGa6xPP5qqRuiC+9gZqbq4Nj Message-ID: <1bbdca2e-b92f-b9dc-dc32-de4de377a7e7@gmx.com> Date: Mon, 24 Feb 2020 21:00:38 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200224125628.27121-1-nborisov@suse.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:vpKkFsIjGvghICiPcGEp8fKUkLF0YKnDCU75VW3wEnzzSTmeXBX IL+5Rw046OozPAiKGU7mT9DXLvBRjXLsaB+jnxqOetzRJYZS5gA+z/HXjTL3x3r07Q6IXM4 l3A7eQUQBy2YA1mgXdYBMNPb9HdI2x42PmMExsIBTOWjn7KOBzNCdpWarBOjki5q3c2RWrZ ia3Bh7W80Nwod3NmKXh6g== X-UI-Out-Filterresults: notjunk:1;V03:K0:ivL4J0R5kp0=:lcAiSIhR4xJajwWyxRKfvG PV4hGB3Tk0+WBlmF+25DwDxcqT/lv1W/sdNj8x1tTOCpKv2TlnWuYBin5rxCcb8cl7eFojGh9 raesknuPZwwHFGbci40nmTh8G42eBoRSD/3KnDip3VcToD39Nn4xTT5xRyQzip9DXff9pPQsb OsUpM/WKnF6YDW2u1/5iDKcwEsaUOfK908GnB886+Jf7aI99weMLfznkyqKLlwVqcdPw900fJ XLw0cLZ8Vjveob37qJ8/87ecL1iLVMRl3rJlbDmsn8QBSc8L77Jl5D3zKFJi965uIURUeA5eI ajrh1hIO+pPT3Jgb3+IGzQdpzL1X38buBb/z+m8QQMUgyCwhLGnmcLZyWch62nSVzvVdie5CF hp6TngIkPYskzg+Rn6Vl7lbW90vBhtW2ltYJrTDR7f/bCi+MGEtc7dvgZiasRd3oijOgJ1RFb /ciSXfyoYmQf8sZbe/Kjttj029R0tPlTn/mgN4Uw4kzUVx1uAZnDSMLenk4cSTSXe+aehu7U9 7b4n78AdG6++Yav9+b5kXuFSSAnwKpiExghltzyEMGmWy8xHed8Lr3HgUYmBAWT0xPchfPBfw +/U1Om4OrjY3OKncihFv7693VI6EOAk1W9/7I+2zIcWJJoDdYa5pmcfr0VxoRyQhxLdM6J7zA 3P+Vv06IwessPFnwA1gdmLd5l12HMj/Dis7PJax6QN7OSG8au/pmx77Y32MS54xUsCgNUmDIl SkxdzagrqixeJiytdV1wkpr8Vo2vzqiiUBwFS4Kw67DqlDhDzWwqlz86cUHPhrGl7hEIYu0Lz AxSA1/T7vuBwBbKtxal6z3XzZXr8l4G/We7L1MHkiblaP86/OXL+PDUYWsp+re4y2HS8udjt6 0gmKZ0Dw486tvU6UTSTfEjGbZXRkhYZ8RIeLhbiqA97MXVF3TLy3hpv2PU/MP4KMD0aU1fkq4 MuGZIg7u9plK/9vsCpLy4W694xxepwYvXHeIZUXpPNpHBdLjQzHYDty3wNvVoCum205nAol8F JPmSN+PkVGocUaF4VzGnwCd0XhfyMQiymlPv87tSKuZxa98xp45BWKABx/szDWWSo9TmRvfdk vLz0EN5Knl0oQFdoKyguV7cD+eq1VIqFlN72nn7YX4DpngfvCt7zQnYMe930r6ovCZPKavBA/ FOM84fGMsxl2o23NR0PomI9x4H5qDZgyIxk8QwJPFr22h1ssCVUL4+IZd7kz5TfXjMUx6nWaf TIIBgK+sMbZhl1elA Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 2020/2/24 =E4=B8=8B=E5=8D=888:56, Nikolay Borisov wrote: > We could return ret uninitlaized in case of success. Before the code was > returning 0 explicitly in case of success but now it will be a random va= lue from > the stack. That's due to ret being set only in error conditions. > > Signed-off-by: Nikolay Borisov Reviewed-by: Qu Wenruo Thanks, Qu > --- > fs/btrfs/check-integrity.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c > index 23dd65e1c5e3..85b27e9742c8 100644 > --- a/fs/btrfs/check-integrity.c > +++ b/fs/btrfs/check-integrity.c > @@ -766,7 +766,7 @@ static int btrfsic_process_superblock_dev_mirror( > struct block_device *const superblock_bdev =3D device->bdev; > struct page *page; > struct address_space *mapping =3D superblock_bdev->bd_inode->i_mapping= ; > - int ret; > + int ret =3D 0; > > /* super block bytenr is always the unmapped device bytenr */ > dev_bytenr =3D btrfs_sb_offset(superblock_mirror_num); > -- > 2.17.1 >