[PATCH 6.6 068/341] netfilter: nf_tables: Unconditionally allocate nft_obj_filter

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Phil Sutter <phil@xxxxxx>

[ Upstream commit 4279cc60b354d2d2b970655a70a151cbfa1d958b ]

Prep work for moving the filter into struct netlink_callback's scratch
area.

Signed-off-by: Phil Sutter <phil@xxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Stable-dep-of: bd662c4218f9 ("netfilter: nf_tables: Add locking for NFT_MSG_GETOBJ_RESET requests")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/netfilter/nf_tables_api.c | 36 +++++++++++++++--------------------
 1 file changed, 15 insertions(+), 21 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index d29c5803c3ff0..35d5848cb3d0d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -7753,11 +7753,9 @@ static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
 				goto cont;
 			if (idx < s_idx)
 				goto cont;
-			if (filter && filter->table &&
-			    strcmp(filter->table, table->name))
+			if (filter->table && strcmp(filter->table, table->name))
 				goto cont;
-			if (filter &&
-			    filter->type != NFT_OBJECT_UNSPEC &&
+			if (filter->type != NFT_OBJECT_UNSPEC &&
 			    obj->ops->type->type != filter->type)
 				goto cont;
 
@@ -7792,23 +7790,21 @@ static int nf_tables_dump_obj_start(struct netlink_callback *cb)
 	const struct nlattr * const *nla = cb->data;
 	struct nft_obj_filter *filter = NULL;
 
-	if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
-		filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
-		if (!filter)
-			return -ENOMEM;
+	filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
+	if (!filter)
+		return -ENOMEM;
 
-		if (nla[NFTA_OBJ_TABLE]) {
-			filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
-			if (!filter->table) {
-				kfree(filter);
-				return -ENOMEM;
-			}
+	if (nla[NFTA_OBJ_TABLE]) {
+		filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
+		if (!filter->table) {
+			kfree(filter);
+			return -ENOMEM;
 		}
-
-		if (nla[NFTA_OBJ_TYPE])
-			filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
 	}
 
+	if (nla[NFTA_OBJ_TYPE])
+		filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
+
 	cb->data = filter;
 	return 0;
 }
@@ -7817,10 +7813,8 @@ static int nf_tables_dump_obj_done(struct netlink_callback *cb)
 {
 	struct nft_obj_filter *filter = cb->data;
 
-	if (filter) {
-		kfree(filter->table);
-		kfree(filter);
-	}
+	kfree(filter->table);
+	kfree(filter);
 
 	return 0;
 }
-- 
2.43.0