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netfilter: nf_tables: Unconditionally allocate nft_obj_filter 

[ Upstream commit 4279cc60b354d2d2b970655a70a151cbfa1d958b ]

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

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Stable-dep-of: bd662c4218f9 ("netfilter: nf_tables: Add locking for NFT_MSG_GETOBJ_RESET requests")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Phil Sutter 2023-10-20 19:34:29 +02:00 committed by Greg Kroah-Hartman
parent 83d37714c1
commit ba9b99d909
1 changed files with 15 additions and 21 deletions
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36
net/netfilter/nf_tables_api.c
View File

@ -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)
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;
}