From: Theodore Ts'o Subject: [PATCH 2.6.33.y 23/40] ext4: check s_log_groups_per_flex in online resize code Date: Tue, 1 Jun 2010 08:03:10 -0400 Message-ID: <1275393807-14369-23-git-send-email-tytso@mit.edu> References: <1275393807-14369-1-git-send-email-tytso@mit.edu> Cc: Ext4 Developers List , Eric Sandeen , "Theodore Ts'o" To: stable@vger.kernel.org Return-path: Received: from THUNK.ORG ([69.25.196.29]:47332 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756102Ab0FAMDi (ORCPT ); Tue, 1 Jun 2010 08:03:38 -0400 In-Reply-To: <1275393807-14369-1-git-send-email-tytso@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: From: Eric Sandeen commit 42007efd569f1cf3bfb9a61da60ef6c2179508ca upstream (as of v2.6.34-git13) If groups_per_flex < 2, sbi->s_flex_groups[] doesn't get filled out, and every other access to this first tests s_log_groups_per_flex; same thing needs to happen in resize or we'll wander off into a null pointer when doing an online resize of the file system. Thanks to Christoph Biedl, who came up with the trivial testcase: # truncate --size 128M fsfile # mkfs.ext3 -F fsfile # tune2fs -O extents,uninit_bg,dir_index,flex_bg,huge_file,dir_nlink,extra_isize fsfile # e2fsck -yDf -C0 fsfile # truncate --size 132M fsfile # losetup /dev/loop0 fsfile # mount /dev/loop0 mnt # resize2fs -p /dev/loop0 https://bugzilla.kernel.org/show_bug.cgi?id=13549 Reported-by: Alessandro Polverini Test-case-by: Christoph Biedl Signed-off-by: Eric Sandeen Signed-off-by: "Theodore Ts'o" --- fs/ext4/resize.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 3b2c554..433ea27 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -930,7 +930,8 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) percpu_counter_add(&sbi->s_freeinodes_counter, EXT4_INODES_PER_GROUP(sb)); - if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) { + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG) && + sbi->s_log_groups_per_flex) { ext4_group_t flex_group; flex_group = ext4_flex_group(sbi, input->group); atomic_add(input->free_blocks_count, -- 1.6.6.1.1.g974db.dirty