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authorMatthias Schiffer <mschiffer@universe-factory.net>2018-03-16 13:29:10 +0300
committerSimon Wunderlich <sw@simonwunderlich.de>2018-03-16 22:23:48 +0300
commit6f27d2c2a8c236d296201c19abb8533ec20d212b (patch)
treeeed24deb0ef1ca001b21a84a02c39a1727c59bcd /net/batman-adv/distributed-arp-table.c
parentbc44b78157f621ff2a2618fe287a827bcb094ac4 (diff)
downloadlinux-6f27d2c2a8c236d296201c19abb8533ec20d212b.tar.xz
batman-adv: fix header size check in batadv_dbg_arp()
Checking for 0 is insufficient: when an SKB without a batadv header, but with a VLAN header is received, hdr_size will be 4, making the following code interpret the Ethernet header as a batadv header. Fixes: be1db4f6615b ("batman-adv: make the Distributed ARP Table vlan aware") Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Diffstat (limited to 'net/batman-adv/distributed-arp-table.c')
-rw-r--r--net/batman-adv/distributed-arp-table.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index 9703c791ffc5..87cd962d28d5 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -393,7 +393,7 @@ static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb,
batadv_arp_hw_src(skb, hdr_size), &ip_src,
batadv_arp_hw_dst(skb, hdr_size), &ip_dst);
- if (hdr_size == 0)
+ if (hdr_size < sizeof(struct batadv_unicast_packet))
return;
unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;