Commit 88209141 authored by Leonardo Bras's avatar Leonardo Bras Committed by Pablo Neira Ayuso
Browse files

netfilter: nft_fib_netdev: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled



If IPv6 is disabled on boot (ipv6.disable=1), but nft_fib_inet ends up
dealing with a IPv6 packet, it causes a kernel panic in
fib6_node_lookup_1(), crashing in bad_page_fault.

The panic is caused by trying to deference a very low address (0x38
in ppc64le), due to ipv6.fib6_main_tbl = NULL.
BUG: Kernel NULL pointer dereference at 0x00000038

The kernel panic was reproduced in a host that disabled IPv6 on boot and
have to process guest packets (coming from a bridge) using it's ip6tables.

Terminate rule evaluation when packet protocol is IPv6 but the ipv6 module
is not loaded.

Signed-off-by: default avatarLeonardo Bras <leonardo@linux.ibm.com>
Acked-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 039b1f4f
......@@ -14,6 +14,7 @@
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>
#include <net/ipv6.h>
#include <net/netfilter/nft_fib.h>
......@@ -34,6 +35,8 @@ static void nft_fib_netdev_eval(const struct nft_expr *expr,
}
break;
case ETH_P_IPV6:
if (!ipv6_mod_enabled())
break;
switch (priv->result) {
case NFT_FIB_RESULT_OIF:
case NFT_FIB_RESULT_OIFNAME:
......
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