diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index c26df6787fb075a4d2317a9d9e8e897813df8e0f..f31fe7b660a555f8d646a415cec7f0b35ea57f9c 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -774,7 +774,7 @@ enum nft_reject_inet_code {
 	NFT_REJECT_ICMPX_ADMIN_PROHIBITED,
 	__NFT_REJECT_ICMPX_MAX
 };
-#define NFT_REJECT_ICMPX_MAX	(__NFT_REJECT_ICMPX_MAX + 1)
+#define NFT_REJECT_ICMPX_MAX	(__NFT_REJECT_ICMPX_MAX - 1)
 
 /**
  * enum nft_reject_attributes - nf_tables reject expression netlink attributes
diff --git a/net/netfilter/nft_reject.c b/net/netfilter/nft_reject.c
index ec8a456092a73d7b8f92e92db46be986770a85e7..57d3e1af56305e90eade03e1fca1b38524091be6 100644
--- a/net/netfilter/nft_reject.c
+++ b/net/netfilter/nft_reject.c
@@ -72,7 +72,7 @@ int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
 }
 EXPORT_SYMBOL_GPL(nft_reject_dump);
 
-static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX] = {
+static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
 	[NFT_REJECT_ICMPX_NO_ROUTE]		= ICMP_NET_UNREACH,
 	[NFT_REJECT_ICMPX_PORT_UNREACH]		= ICMP_PORT_UNREACH,
 	[NFT_REJECT_ICMPX_HOST_UNREACH]		= ICMP_HOST_UNREACH,
@@ -81,8 +81,7 @@ static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX] = {
 
 int nft_reject_icmp_code(u8 code)
 {
-	if (code > NFT_REJECT_ICMPX_MAX)
-		return -EINVAL;
+	BUG_ON(code > NFT_REJECT_ICMPX_MAX);
 
 	return icmp_code_v4[code];
 }
@@ -90,7 +89,7 @@ int nft_reject_icmp_code(u8 code)
 EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
 
 
-static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX] = {
+static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
 	[NFT_REJECT_ICMPX_NO_ROUTE]		= ICMPV6_NOROUTE,
 	[NFT_REJECT_ICMPX_PORT_UNREACH]		= ICMPV6_PORT_UNREACH,
 	[NFT_REJECT_ICMPX_HOST_UNREACH]		= ICMPV6_ADDR_UNREACH,
@@ -99,8 +98,7 @@ static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX] = {
 
 int nft_reject_icmpv6_code(u8 code)
 {
-	if (code > NFT_REJECT_ICMPX_MAX)
-		return -EINVAL;
+	BUG_ON(code > NFT_REJECT_ICMPX_MAX);
 
 	return icmp_code_v6[code];
 }