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ext4: make sure to reset inode lockdep class when quota enabling fails

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commit 4013d47a53 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Kara 2021-10-07 17:53:36 +02:00 • committed by Greg Kroah-Hartman
commit 762e4c33e9
1 changed files with 12 additions and 1 deletions
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13
fs/ext4/super.c
View file

@ -6427,8 +6427,19 @@ static 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;
}