5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
[ Upstream commit 23a3bfd4ba7acd36abf52b78605f61b21bdac216 ]
Anonymous sets need to be populated once at creation and then they are
bound to rule since 938154b93be8 ("netfilter: nf_tables: reject unbound
anonymous set before commit phase"), otherwise transaction reports
EINVAL.
Userspace does not need to delete elements of anonymous sets that are
not yet bound, reject this with EOPNOTSUPP.
>From flush command path, skip anonymous sets, they are expected to be
bound already. Otherwise, EINVAL is hit at the end of this transaction
for unbound sets.
Fixes: 96518518cc41 ("netfilter: add nftables")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/netfilter/nf_tables_api.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 32c97cc87ddc2..52c776b5967ef 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1267,8 +1267,7 @@ static int nft_flush_table(struct nft_ctx *ctx)
if (!nft_is_active_next(ctx->net, set))
continue;
- if (nft_set_is_anonymous(set) &&
- !list_empty(&set->bindings))
+ if (nft_set_is_anonymous(set))
continue;
err = nft_delset(ctx, set);
@@ -5922,8 +5921,10 @@ static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
if (IS_ERR(set))
return PTR_ERR(set);
- if (!list_empty(&set->bindings) &&
- (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
+ if (nft_set_is_anonymous(set))
+ return -EOPNOTSUPP;
+
+ if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
return -EBUSY;
if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
--
2.40.1
