From 2964e5fe855b060dcc153a50605f79b5d424f934 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Fri, 6 Sep 2019 17:12:30 +0200
Git-commit: b44492afd2b123f605c3aa2cbeee3398d9ebbcc5
Patch-mainline: v5.4-rc1
References: git-fixes

Subject: [PATCH] netfilter: nf_tables_offload: avoid excessive stack usage

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>
Acked-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
 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 04fbab60e808..006cdb0f5900 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);
-- 
2.16.4