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authorJan Kara <jack@suse.cz>2021-08-12 15:31:22 +0200
committerTheodore Ts'o <tytso@mit.edu>2021-08-30 23:36:50 -0400
commitbd2c38cf1726ea913024393a0d11f2e2a3f4c180 (patch)
tree147620e9e40875a3eed164c97a01d46b8ec21965 /fs/ext4/inode.c
parentb2bbb92f7042e8075fb036bf97043339576330c3 (diff)
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 <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Link: https://lore.kernel.org/r/20210812133122.26360-1-jack@suse.cz
Diffstat (limited to 'fs/ext4/inode.c')
-rw-r--r--fs/ext4/inode.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d8de607849df..2c33c795c4a7 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,