quota: Properly disable quotas when add_dquot_ref() fails

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>

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index ffd40dc..6beceed 100644 (file)
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2420,7 +2420,8 @@ 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: