From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 17 Mar 2022 11:04:42 +0000 (+0100)
Subject: netfilter: nf_tables: initialize registers in nft_do_chain()
X-Git-Tag: v4.19.237~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=88791b79a1eb2ba94e95d039243e28433583a67b;p=thirdparty%2Fkernel%2Fstable.git

netfilter: nf_tables: initialize registers in nft_do_chain()

commit 4c905f6740a365464e91467aa50916555b28213d upstream.

Initialize registers to avoid stack leak into userspace.

Fixes: 96518518cc41 ("netfilter: add nftables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index a3850414dba2d..7dfaad783cd55 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -144,7 +144,7 @@ nft_do_chain(struct nft_pktinfo *pkt, void *priv)
 	struct nft_rule *const *rules;
 	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];
 	bool genbit = READ_ONCE(net->nft.gencursor);