mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-12 13:55:32 +00:00
Code Issues Releases Wiki Activity

ext4: Make sure quota files are not grabbed accidentally

Browse source 
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 <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20210812133122.26360-1-jack@suse.cz
This commit is contained in:
Jan Kara 2021-08-12 15:31:22 +02:00 committed by Theodore Ts'o
parent b2bbb92f70
commit bd2c38cf17
1 changed files with 6 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
fs/ext4/inode.c
View file

@ -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,