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quota: Properly disable quotas when add_dquot_ref() fails

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[ Upstream commit 6a4e336379 ]

When add_dquot_ref() fails (usually due to IO error or ENOMEM), we want
to disable quotas we are trying to enable. However dquot_disable() call
was passed just the flags we are enabling so in case flags ==
DQUOT_USAGE_ENABLED dquot_disable() call will just fail with EINVAL
instead of properly disabling quotas. Fix the problem by always passing
DQUOT_LIMITS_ENABLED | DQUOT_USAGE_ENABLED to dquot_disable() in this
case.

Reported-and-tested-by: Ye Bin <yebin10@huawei.com>
Reported-by: syzbot+e633c79ceaecbf479854@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <20230605140731.2427629-2-yebin10@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jan Kara 2023-06-05 22:07:30 +08:00 committed by Greg Kroah-Hartman
parent d363075066
commit 32c2f51fff
1 changed files with 2 additions and 1 deletions
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3
fs/quota/dquot.c
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@ -2413,7 +2413,8 @@ int dquot_load_quota_sb(struct super_block *sb, int type, int format_id,
error = add_dquot_ref(sb, type);
if (error)
dquot_disable(sb, type, flags);
dquot_disable(sb, type,
DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
return error;
out_fmt: