netfilter: nf_tables: typo NULL check in _clone() function

This should check for NULL in case memory allocation fails.

Reported-by: Julian Wiedmann <jwiedmann.dev@gmail.com>
Fixes: 3b9e2ea ("netfilter: nft_limit: move stateful fields out of expression data")
Fixes: 37f319f ("netfilter: nft_connlimit: move stateful fields out of expression data")
Fixes: 33a24de ("netfilter: nft_last: move stateful fields out of expression data")
Fixes: ed0a0c6 ("netfilter: nft_quota: move stateful fields out of expression data")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Link: https://lore.kernel.org/r/20220110194817.53481-1-pablo@netfilter.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/netfilter/nft_connlimit.c

@@ -206,7 +206,7 @@ static int nft_connlimit_clone(struct nft_expr *dst, const struct nft_expr *src)
 	struct nft_connlimit *priv_src = nft_expr_priv(src);
 
 	priv_dst->list = kmalloc(sizeof(*priv_dst->list), GFP_ATOMIC);
-	if (priv_dst->list)
+	if (!priv_dst->list)
 		return -ENOMEM;
 
 	nf_conncount_list_init(priv_dst->list);

net/netfilter/nft_last.c

@@ -106,7 +106,7 @@ static int nft_last_clone(struct nft_expr *dst, const struct nft_expr *src)
 	struct nft_last_priv *priv_dst = nft_expr_priv(dst);
 
 	priv_dst->last = kzalloc(sizeof(*priv_dst->last), GFP_ATOMIC);
-	if (priv_dst->last)
+	if (!priv_dst->last)
 		return -ENOMEM;
 
 	return 0;

net/netfilter/nft_limit.c

@@ -145,7 +145,7 @@ static int nft_limit_clone(struct nft_limit_priv *priv_dst,
 	priv_dst->invert = priv_src->invert;
 
 	priv_dst->limit = kmalloc(sizeof(*priv_dst->limit), GFP_ATOMIC);
-	if (priv_dst->limit)
+	if (!priv_dst->limit)
 		return -ENOMEM;
 
 	spin_lock_init(&priv_dst->limit->lock);

net/netfilter/nft_quota.c

@@ -237,7 +237,7 @@ static int nft_quota_clone(struct nft_expr *dst, const struct nft_expr *src)
 	struct nft_quota *priv_dst = nft_expr_priv(dst);
 
 	priv_dst->consumed = kmalloc(sizeof(*priv_dst->consumed), GFP_ATOMIC);
-	if (priv_dst->consumed)
+	if (!priv_dst->consumed)
 		return -ENOMEM;
 
 	atomic64_set(priv_dst->consumed, 0);