From: Jan Kara jack@suse.cz
[ Upstream commit bd2c38cf1726ea913024393a0d11f2e2a3f4c180 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- 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 7959aae4857e..e81662dee1f0 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4848,6 +4848,7 @@ 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; @@ -4858,9 +4859,12 @@ 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,