netfilter: fix wrong arithmetics regarding NFT_REJECT_ICMPX_MAX

NFT_REJECT_ICMPX_MAX should be __NFT_REJECT_ICMPX_MAX - 1.

nft_reject_icmp_code() and nft_reject_icmpv6_code() are called from the
packet path, so BUG_ON in case we try to access an unknown abstracted
ICMP code. This should not happen since we already validate this from
nft_reject_{inet,bridge}_init().

Fixes: 51b0a5d ("netfilter: nft_reject: introduce icmp code abstraction for inet and bridge")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index c26df67..f31fe7b 100644 (file)
--- 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 ec8a456..57d3e1a 100644 (file)
--- a/net/netfilter/nft_reject.c
+++ b/net/netfilter/nft_reject.c
@@ -72,7 +72,7 @@ nla_put_failure:
 }
 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];
 }