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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 02/27] netfilter: nf_tables_offload: avoid excessive stack usage
Date: Fri, 13 Sep 2019 13:30:37 +0200	[thread overview]
Message-ID: <20190913113102.15776-3-pablo@netfilter.org> (raw)
In-Reply-To: <20190913113102.15776-1-pablo@netfilter.org>

From: Arnd Bergmann <arnd@arndb.de>

The nft_offload_ctx structure is much too large to put on the
stack:

net/netfilter/nf_tables_offload.c:31:23: error: stack frame size of 1200 bytes in function 'nft_flow_rule_create' [-Werror,-Wframe-larger-than=]

Use dynamic allocation here, as we do elsewhere in the same
function.

Fixes: c9626a2cbdb2 ("netfilter: nf_tables: add hardware offload support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_tables_offload.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c
index 3c2725ade61b..fabe2997188b 100644
--- a/net/netfilter/nf_tables_offload.c
+++ b/net/netfilter/nf_tables_offload.c
@@ -30,11 +30,7 @@ static struct nft_flow_rule *nft_flow_rule_alloc(int num_actions)
 
 struct nft_flow_rule *nft_flow_rule_create(const struct nft_rule *rule)
 {
-	struct nft_offload_ctx ctx = {
-		.dep	= {
-			.type	= NFT_OFFLOAD_DEP_UNSPEC,
-		},
-	};
+	struct nft_offload_ctx *ctx;
 	struct nft_flow_rule *flow;
 	int num_actions = 0, err;
 	struct nft_expr *expr;
@@ -52,21 +48,31 @@ struct nft_flow_rule *nft_flow_rule_create(const struct nft_rule *rule)
 		return ERR_PTR(-ENOMEM);
 
 	expr = nft_expr_first(rule);
+
+	ctx = kzalloc(sizeof(struct nft_offload_ctx), GFP_KERNEL);
+	if (!ctx) {
+		err = -ENOMEM;
+		goto err_out;
+	}
+	ctx->dep.type = NFT_OFFLOAD_DEP_UNSPEC;
+
 	while (expr->ops && expr != nft_expr_last(rule)) {
 		if (!expr->ops->offload) {
 			err = -EOPNOTSUPP;
 			goto err_out;
 		}
-		err = expr->ops->offload(&ctx, flow, expr);
+		err = expr->ops->offload(ctx, flow, expr);
 		if (err < 0)
 			goto err_out;
 
 		expr = nft_expr_next(expr);
 	}
-	flow->proto = ctx.dep.l3num;
+	flow->proto = ctx->dep.l3num;
+	kfree(ctx);
 
 	return flow;
 err_out:
+	kfree(ctx);
 	nft_flow_rule_destroy(flow);
 
 	return ERR_PTR(err);
-- 
2.11.0


  parent reply	other threads:[~2019-09-13 11:31 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-13 11:30 [PATCH 00/27] Netfilter updates for net-next Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 01/27] netfilter: nf_tables: Fix an Oops in nf_tables_updobj() error handling Pablo Neira Ayuso
2019-09-13 11:30 ` Pablo Neira Ayuso [this message]
2019-09-13 11:30 ` [PATCH 03/27] netfilter: nf_tables_offload: move indirect flow_block callback logic to core Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 04/27] netfilter: nft_synproxy: add synproxy stateful object support Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 05/27] netfilter: nft_{fwd,dup}_netdev: add offload support Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 06/27] netfilter: nf_tables_offload: add __nft_offload_get_chain function Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 07/27] netfilter: nf_tables_offload: refactor the nft_flow_offload_chain function Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 08/27] netfilter: nf_tables_offload: refactor the nft_flow_offload_rule function Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 09/27] netfilter: nf_tables_offload: remove rules when the device unregisters Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 10/27] netfilter: fix include guards Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 11/27] netfilter: fix coding-style errors Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 12/27] netfilter: ip_tables: remove unused function declarations Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 13/27] netfilter: inline xt_hashlimit, ebt_802_3 and xt_physdev headers Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 14/27] netfilter: update include directives Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 15/27] netfilter: remove nf_conntrack_icmpv6.h header Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 16/27] netfilter: move inline nf_ip6_ext_hdr() function to a more appropriate header Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 17/27] netfilter: synproxy: move code between headers Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 18/27] netfilter: move nf_bridge_frag_data struct definition to a more appropriate header Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 19/27] netfilter: conntrack: use consistent style when defining inline functions Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 20/27] netfilter: replace defined(CONFIG...) || defined(CONFIG...MODULE) with IS_ENABLED(CONFIG...) Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 21/27] netfilter: conntrack: wrap two inline functions in config checks Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 22/27] netfilter: br_netfilter: update stub br_nf_pre_routing_ipv6 parameter to `void *priv` Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 23/27] netfilter: conntrack: move code to linux/nf_conntrack_common.h Pablo Neira Ayuso
2019-09-13 11:30 ` [PATCH 24/27] netfilter: conntrack: remove CONFIG_NF_CONNTRACK check from nf_conntrack_acct.h Pablo Neira Ayuso
2019-09-13 11:31 ` [PATCH 25/27] netfilter: remove CONFIG_NETFILTER checks from headers Pablo Neira Ayuso
2019-09-13 11:31 ` [PATCH 26/27] netfilter: conntrack: remove CONFIG_NF_CONNTRACK checks from nf_conntrack_zones.h Pablo Neira Ayuso
2019-09-13 11:31 ` [PATCH 27/27] netfilter: conntrack: remove two unused functions from nf_conntrack_timestamp.h Pablo Neira Ayuso
2019-09-13 13:40 ` [PATCH 00/27] Netfilter updates for net-next David Miller

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