From e0ffdbc78d84e1da090f03ab62da3def0e65159e Mon Sep 17 00:00:00 2001 From: Liping Zhang Date: Wed, 23 Nov 2016 22:12:21 +0800 Subject: [PATCH] netfilter: nft_fib_ipv4: initialize *dest to zero 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 Acked-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- 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; -- 2.34.1