From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Wed, 15 Oct 2014 22:16:57 +0000 (+0200)
Subject: netfilter: nft_nat: insufficient attribute validation
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5c819a39753d6a3ae9c0092236f59730a369b619;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

netfilter: nft_nat: insufficient attribute validation

We have to validate that we at least get an NFTA_NAT_REG_ADDR_MIN or
NFTA_NFT_REG_PROTO_MIN attribute. Reject the configuration if none
of them are present.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

diff --git a/net/netfilter/nft_nat.c b/net/netfilter/nft_nat.c
index 0f0af6e86fb8..5078f1f1c569 100644
--- a/net/netfilter/nft_nat.c
+++ b/net/netfilter/nft_nat.c
@@ -99,7 +99,9 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 	if (err < 0)
 		return err;
 
-	if (tb[NFTA_NAT_TYPE] == NULL)
+	if (tb[NFTA_NAT_TYPE] == NULL ||
+	    (tb[NFTA_NAT_REG_ADDR_MIN] == NULL &&
+	     tb[NFTA_NAT_REG_PROTO_MIN] == NULL))
 		return -EINVAL;
 
 	switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {