From: Florian Westphal <fw@strlen.de>
Date: Sun, 3 Nov 2019 20:54:28 +0100
Subject: bridge: ebtables: don't crash when using dnat target in output chains
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Patch-mainline: v5.4-rc7
Git-commit: b23c0742c2ce7e33ed79d10e451f70fdb5ca85d1
References: bsc#1154353 bnc#1151927 5.3.15
xt_in() returns NULL in the output hook, skip the pkt_type change for
that case, redirection only makes sense in broute/prerouting hooks.
Reported-by: Tom Yan <tom.ty89@gmail.com>
Cc: Linus Lüssing <linus.luessing@c0d3.blue>
Fixes: cf3cb246e277d ("bridge: ebtables: fix reception of frames DNAT-ed to bridge device/port")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/bridge/netfilter/ebt_dnat.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
--- a/net/bridge/netfilter/ebt_dnat.c
+++ b/net/bridge/netfilter/ebt_dnat.c
@@ -20,7 +20,6 @@ static unsigned int
ebt_dnat_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct ebt_nat_info *info = par->targinfo;
- struct net_device *dev;
if (skb_ensure_writable(skb, ETH_ALEN))
return EBT_DROP;
@@ -33,10 +32,22 @@ ebt_dnat_tg(struct sk_buff *skb, const s
else
skb->pkt_type = PACKET_MULTICAST;
} else {
- if (xt_hooknum(par) != NF_BR_BROUTING)
- dev = br_port_get_rcu(xt_in(par))->br->dev;
- else
+ const struct net_device *dev;
+
+ switch (xt_hooknum(par)) {
+ case NF_BR_BROUTING:
dev = xt_in(par);
+ break;
+ case NF_BR_PRE_ROUTING:
+ dev = br_port_get_rcu(xt_in(par))->br->dev;
+ break;
+ default:
+ dev = NULL;
+ break;
+ }
+
+ if (!dev) /* NF_BR_LOCAL_OUT */
+ return info->target;
if (ether_addr_equal(info->mac, dev->dev_addr))
skb->pkt_type = PACKET_HOST;