From: Liping Zhang <zlpnobody@xxxxxxxxx>
Otherwise, if fib lookup fail, *dest will be filled with garbage value,
so reverse path filtering will not work properly:
# nft add rule x prerouting fib saddr oif eq 0 drop
Fixes: f6d0cbcf09c5 ("netfilter: nf_tables: add fib expression")
Signed-off-by: Liping Zhang <zlpnobody@xxxxxxxxx>
Acked-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/ipv4/netfilter/nft_fib_ipv4.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/ipv4/netfilter/nft_fib_ipv4.c b/net/ipv4/netfilter/nft_fib_ipv4.c
index bfffa742f397..258136364f5e 100644
--- a/net/ipv4/netfilter/nft_fib_ipv4.c
+++ b/net/ipv4/netfilter/nft_fib_ipv4.c
@@ -122,6 +122,8 @@ void nft_fib4_eval(const struct nft_expr *expr, struct nft_regs *regs,
fl4.saddr = get_saddr(iph->daddr);
}
+ *dest = 0;
+
if (fib_lookup(nft_net(pkt), &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE))
return;
--
2.1.4
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