From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 17 Mar 2022 12:04:42 +0100
Subject: netfilter: nf_tables: initialize registers in nft_do_chain()
Patch-mainline: v5.18-rc1
Git-commit: 4c905f6740a365464e91467aa50916555b28213d
References: CVE-2022-1016 bsc#1197227

Initialize registers to avoid stack leak into userspace.

Fixes: 96518518cc41 ("netfilter: add nftables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Michal Kubecek <mkubecek@suse.cz>

---
 net/netfilter/nf_tables_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -129,7 +129,7 @@ nft_do_chain(struct nft_pktinfo *pkt, void *priv)
 	struct nft_stats __percpu *pstats;
 	const struct nft_rule *rule;
 	const struct nft_expr *expr, *last;
-	struct nft_regs regs;
+	struct nft_regs regs = {};
 	unsigned int stackptr = 0;
 	struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
 	struct nft_stats *stats;