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netfilter: nf_tables: skip immediate deactivate in _PREPARE_ERROR

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On error when building the rule, the immediate expression unbinds the
chain, hence objects can be deactivated by the transaction records.

Otherwise, it is possible to trigger the following warning:

 WARNING: CPU: 3 PID: 915 at net/netfilter/nf_tables_api.c:2013 nf_tables_chain_destroy+0x1f7/0x210 [nf_tables]
 CPU: 3 PID: 915 Comm: chain-bind-err- Not tainted 6.1.39 #1
 RIP: 0010:nf_tables_chain_destroy+0x1f7/0x210 [nf_tables]

Fixes: 4bedf9eee0 ("netfilter: nf_tables: fix chain binding transaction logic")
Reported-by: Kevin Rich <kevinrich1337@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Pablo Neira Ayuso 2023-07-23 16:24:46 +02:00 committed by Florian Westphal
parent f718863aca
commit 0a771f7b26
1 changed files with 18 additions and 9 deletions
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27
net/netfilter/nft_immediate.c
View file

@ -125,15 +125,27 @@ static void nft_immediate_activate(const struct nft_ctx *ctx,
return nft_data_hold(&priv->data, nft_dreg_to_type(priv->dreg));
}
static void nft_immediate_chain_deactivate(const struct nft_ctx *ctx,
struct nft_chain *chain,
enum nft_trans_phase phase)
{
struct nft_ctx chain_ctx;
struct nft_rule *rule;
chain_ctx = *ctx;
chain_ctx.chain = chain;
list_for_each_entry(rule, &chain->rules, list)
nft_rule_expr_deactivate(&chain_ctx, rule, phase);
}
static void nft_immediate_deactivate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
enum nft_trans_phase phase)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
const struct nft_data *data = &priv->data;
struct nft_ctx chain_ctx;
struct nft_chain *chain;
struct nft_rule *rule;
if (priv->dreg == NFT_REG_VERDICT) {
switch (data->verdict.code) {
@ -143,20 +155,17 @@ static void nft_immediate_deactivate(const struct nft_ctx *ctx,
if (!nft_chain_binding(chain))
break;
chain_ctx = *ctx;
chain_ctx.chain = chain;
list_for_each_entry(rule, &chain->rules, list)
nft_rule_expr_deactivate(&chain_ctx, rule, phase);
switch (phase) {
case NFT_TRANS_PREPARE_ERROR:
nf_tables_unbind_chain(ctx, chain);
fallthrough;
nft_deactivate_next(ctx->net, chain);
break;
case NFT_TRANS_PREPARE:
nft_immediate_chain_deactivate(ctx, chain, phase);
nft_deactivate_next(ctx->net, chain);
break;
default:
nft_immediate_chain_deactivate(ctx, chain, phase);
nft_chain_del(chain);
chain->bound = false;
nft_use_dec(&chain->table->use);