Subject: [PATCH v2 1/1] netfilter: nf_tables: fib: Drop IPV6 packages if IPv6 is disabled on boot

From: Leonardo Bras <[email-masked]>
Date: Wed, 21 Aug 2019 11:15:06 -0300

If IPv6 is disabled on boot (ipv6.disable=1), but nft_fib_inet ends up
dealing with a IPv6 package, 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

Fix this behavior by dropping IPv6 packages if !ipv6_mod_enabled().

Signed-off-by: Leonardo Bras <[email-masked]>
---
Changes from v1:
- Move drop logic from nft_fib_inet_eval() to nft_fib6_eval{,_type}
so it can affect other usages of these functions. 

 net/ipv6/netfilter/nft_fib_ipv6.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/net/ipv6/netfilter/nft_fib_ipv6.c b/net/ipv6/netfilter/nft_fib_ipv6.c
index 7ece86afd079..75acc417e2ff 100644
--- a/net/ipv6/netfilter/nft_fib_ipv6.c
+++ b/net/ipv6/netfilter/nft_fib_ipv6.c
@@ -125,6 +125,11 @@ void nft_fib6_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
 	u32 *dest = &regs->data[priv->dreg];
 	struct ipv6hdr *iph, _iph;
 
+	if (!ipv6_mod_enabled()) {
+		regs->verdict.code = NF_DROP;
+		return;
+	}
+
 	iph = skb_header_pointer(pkt->skb, noff, sizeof(_iph), &_iph);
 	if (!iph) {
 		regs->verdict.code = NFT_BREAK;
@@ -150,6 +155,11 @@ void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
 	struct rt6_info *rt;
 	int lookup_flags;
 
+	if (!ipv6_mod_enabled()) {
+		regs->verdict.code = NF_DROP;
+		return;
+	}
+
 	if (priv->flags & NFTA_FIB_F_IIF)
 		oif = nft_in(pkt);
 	else if (priv->flags & NFTA_FIB_F_OIF)
-- 
2.20.1