diff options
| author | Jan Kara <jack@suse.cz> | 2021-10-07 18:53:36 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2022-01-10 21:25:55 +0300 |
| commit | 4013d47a5307fdb5c13370b5392498b00fedd274 (patch) | |
| tree | c19a4f3b10c3c52a2056af076c0f2928a443ee92 /fs | |
| parent | 15fc69bbbbbc8c72e5f6cc4e1be0f51283c5448e (diff) | |
| download | linux-4013d47a5307fdb5c13370b5392498b00fedd274.tar.xz | |
ext4: make sure to reset inode lockdep class when quota enabling fails
When we succeed in enabling some quota type but fail to enable another
one with quota feature, we correctly disable all enabled quota types.
However we forget to reset i_data_sem lockdep class. When the inode gets
freed and reused, it will inherit this lockdep class (i_data_sem is
initialized only when a slab is created) and thus eventually lockdep
barfs about possible deadlocks.
Reported-and-tested-by: syzbot+3b6f9218b1301ddda3e2@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: stable@kernel.org
Link: https://lore.kernel.org/r/20211007155336.12493-3-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/super.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 863a3eae505a..1b55f234e006 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -6837,8 +6837,19 @@ int ext4_enable_quotas(struct super_block *sb) "Failed to enable quota tracking " "(type=%d, err=%d). Please run " "e2fsck to fix.", type, err); - for (type--; type >= 0; type--) + for (type--; type >= 0; type--) { + struct inode *inode; + + inode = sb_dqopt(sb)->files[type]; + if (inode) + inode = igrab(inode); dquot_quota_off(sb, type); + if (inode) { + lockdep_set_quota_inode(inode, + I_DATA_SEM_NORMAL); + iput(inode); + } + } return err; } |