From bd2c38cf1726ea913024393a0d11f2e2a3f4c180 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 12 Aug 2021 15:31:22 +0200 Subject: [PATCH] ext4: Make sure quota files are not grabbed accidentally If ext4 filesystem is corrupted so that quota files are linked from directory hirerarchy, bad things can happen. E.g. quota files can get corrupted or deleted. Make sure we are not grabbing quota file inodes when we expect normal inodes. Signed-off-by: Jan Kara Signed-off-by: Theodore Ts'o Link: https://lore.kernel.org/r/20210812133122.26360-1-jack@suse.cz --- fs/ext4/inode.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index d8de607..2c33c79 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4603,6 +4603,7 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, struct ext4_iloc iloc; struct ext4_inode *raw_inode; struct ext4_inode_info *ei; + struct ext4_super_block *es = EXT4_SB(sb)->s_es; struct inode *inode; journal_t *journal = EXT4_SB(sb)->s_journal; long ret; @@ -4613,9 +4614,12 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, projid_t i_projid; if ((!(flags & EXT4_IGET_SPECIAL) && - (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)) || + ((ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) || + ino == le32_to_cpu(es->s_usr_quota_inum) || + ino == le32_to_cpu(es->s_grp_quota_inum) || + ino == le32_to_cpu(es->s_prj_quota_inum))) || (ino < EXT4_ROOT_INO) || - (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))) { + (ino > le32_to_cpu(es->s_inodes_count))) { if (flags & EXT4_IGET_HANDLE) return ERR_PTR(-ESTALE); __ext4_error(sb, function, line, false, EFSCORRUPTED, 0, -- 2.7.4