[linux-next] LinuxNextTracking branch, master, updated. next-20180323

batman at open-mesh.org batman at open-mesh.org
Sat Mar 24 00:17:17 CET 2018


The following commit has been merged in the master branch:
commit bc44b78157f621ff2a2618fe287a827bcb094ac4
Author: Matthias Schiffer <mschiffer at universe-factory.net>
Date:   Fri Mar 16 11:29:09 2018 +0100

    batman-adv: update data pointers after skb_cow()
    
    batadv_check_unicast_ttvn() calls skb_cow(), so pointers into the SKB data
    must be (re)set after calling it. The ethhdr variable is dropped
    altogether.
    
    Fixes: 7cdcf6dddc42 ("batman-adv: add UNICAST_4ADDR packet type")
    Signed-off-by: Matthias Schiffer <mschiffer at universe-factory.net>
    Signed-off-by: Sven Eckelmann <sven at narfation.org>
    Signed-off-by: Simon Wunderlich <sw at simonwunderlich.de>

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index b6891e8b741c..6a9242658c8d 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -968,14 +968,10 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
 	struct batadv_orig_node *orig_node = NULL, *orig_node_gw = NULL;
 	int check, hdr_size = sizeof(*unicast_packet);
 	enum batadv_subtype subtype;
-	struct ethhdr *ethhdr;
 	int ret = NET_RX_DROP;
 	bool is4addr, is_gw;
 
 	unicast_packet = (struct batadv_unicast_packet *)skb->data;
-	unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
-	ethhdr = eth_hdr(skb);
-
 	is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR;
 	/* the caller function should have already pulled 2 bytes */
 	if (is4addr)
@@ -995,12 +991,14 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
 	if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size))
 		goto free_skb;
 
+	unicast_packet = (struct batadv_unicast_packet *)skb->data;
+
 	/* packet for me */
 	if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) {
 		/* If this is a unicast packet from another backgone gw,
 		 * drop it.
 		 */
-		orig_addr_gw = ethhdr->h_source;
+		orig_addr_gw = eth_hdr(skb)->h_source;
 		orig_node_gw = batadv_orig_hash_find(bat_priv, orig_addr_gw);
 		if (orig_node_gw) {
 			is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw,
@@ -1015,6 +1013,8 @@ int batadv_recv_unicast_packet(struct sk_buff *skb,
 		}
 
 		if (is4addr) {
+			unicast_4addr_packet =
+				(struct batadv_unicast_4addr_packet *)skb->data;
 			subtype = unicast_4addr_packet->subtype;
 			batadv_dat_inc_counter(bat_priv, subtype);
 

-- 
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