From: Florian Westphal fw@strlen.de
[ Upstream commit 447750f281abef547be44fdcfe3bc4447b3115a8 ]
Its possible to set both HANDLE and POSITION when replacing a rule. In this case, the rule at POSITION gets replaced using the userspace-provided handle. Rule handles are supposed to be generated by the kernel only.
Duplicate handles should be harmless, however better disable this "feature" by only checking for the POSITION attribute on insert operations.
Fixes: 5e94846686d0 ("netfilter: nf_tables: add insert operation") Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/netfilter/nf_tables_api.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index ec0f8b5bde0aa..0e1b1f7f4745e 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -2610,17 +2610,14 @@ static int nf_tables_newrule(struct net *net, struct sock *nlsk,
if (chain->use == UINT_MAX) return -EOVERFLOW; - } - - if (nla[NFTA_RULE_POSITION]) { - if (!(nlh->nlmsg_flags & NLM_F_CREATE)) - return -EOPNOTSUPP;
- pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); - old_rule = __nft_rule_lookup(chain, pos_handle); - if (IS_ERR(old_rule)) { - NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]); - return PTR_ERR(old_rule); + if (nla[NFTA_RULE_POSITION]) { + pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); + old_rule = __nft_rule_lookup(chain, pos_handle); + if (IS_ERR(old_rule)) { + NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]); + return PTR_ERR(old_rule); + } } }