From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50013 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752478AbbFCCm4 (ORCPT ); Tue, 2 Jun 2015 22:42:56 -0400 Subject: Patch "ext4: check for zero length extent explicitly" has been added to the 4.0-stable tree To: guaneryu@gmail.com, gregkh@linuxfoundation.org, tytso@mit.edu Cc: , From: Date: Wed, 03 Jun 2015 11:42:49 +0900 Message-ID: <14332993694736@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled ext4: check for zero length extent explicitly to the 4.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ext4-check-for-zero-length-extent-explicitly.patch and it can be found in the queue-4.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 2f974865ffdfe7b9f46a9940836c8b167342563d Mon Sep 17 00:00:00 2001 From: Eryu Guan Date: Thu, 14 May 2015 19:00:45 -0400 Subject: ext4: check for zero length extent explicitly From: Eryu Guan commit 2f974865ffdfe7b9f46a9940836c8b167342563d upstream. The following commit introduced a bug when checking for zero length extent 5946d08 ext4: check for overlapping extents in ext4_valid_extent_entries() Zero length extent could pass the check if lblock is zero. Adding the explicit check for zero length back. Signed-off-by: Eryu Guan Signed-off-by: Theodore Ts'o Signed-off-by: Greg Kroah-Hartman --- fs/ext4/extents.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -377,7 +377,7 @@ static int ext4_valid_extent(struct inod ext4_lblk_t lblock = le32_to_cpu(ext->ee_block); ext4_lblk_t last = lblock + len - 1; - if (lblock > last) + if (len == 0 || lblock > last) return 0; return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len); } Patches currently in stable-queue which might be from guaneryu@gmail.com are queue-4.0/ext4-check-for-zero-length-extent-explicitly.patch