From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935990AbdDSOtZ (ORCPT ); Wed, 19 Apr 2017 10:49:25 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:47304 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935786AbdDSOpk (ORCPT ); Wed, 19 Apr 2017 10:45:40 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nix , Daeho Jeong , Youngjin Gil , "Darrick J. Wong" , Theodore Tso Subject: [PATCH 4.9 53/69] ext4: fix inode checksum calculation problem if i_extra_size is small Date: Wed, 19 Apr 2017 16:43:09 +0200 Message-Id: <20170419141619.101213206@linuxfoundation.org> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20170419141616.919951169@linuxfoundation.org> References: <20170419141616.919951169@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Daeho Jeong commit 05ac5aa18abd7db341e54df4ae2b4c98ea0e43b7 upstream. We've fixed the race condition problem in calculating ext4 checksum value in commit b47820edd163 ("ext4: avoid modifying checksum fields directly during checksum veficationon"). However, by this change, when calculating the checksum value of inode whose i_extra_size is less than 4, we couldn't calculate the checksum value in a proper way. This problem was found and reported by Nix, Thank you. Reported-by: Nix Signed-off-by: Daeho Jeong Signed-off-by: Youngjin Gil Signed-off-by: Darrick J. Wong Signed-off-by: Theodore Ts'o Signed-off-by: Greg Kroah-Hartman --- fs/ext4/inode.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -71,10 +71,9 @@ static __u32 ext4_inode_csum(struct inod csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, csum_size); offset += csum_size; - csum = ext4_chksum(sbi, csum, (__u8 *)raw + offset, - EXT4_INODE_SIZE(inode->i_sb) - - offset); } + csum = ext4_chksum(sbi, csum, (__u8 *)raw + offset, + EXT4_INODE_SIZE(inode->i_sb) - offset); } return csum;