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authorFlorian Westphal <fw@strlen.de>2016-05-11 00:17:59 +0300
committerAntonio Quartulli <a@unstable.cc>2016-05-18 06:49:38 +0300
commit63d443efe8be2c1d02b30d7e4edeb9aa085352b3 (patch)
tree2d50b3ba410917d098c4ff4fb87aa78f09626448 /net/batman-adv
parent917fa5353da05e8a0045b8acacba8d50400d5b12 (diff)
downloadlinux-63d443efe8be2c1d02b30d7e4edeb9aa085352b3.tar.xz
batman-adv: fix skb deref after free
batadv_send_skb_to_orig() calls dev_queue_xmit() so we can't use skb->len. Fixes: 953324776d6d ("batman-adv: network coding - buffer unicast packets before forward") Signed-off-by: Florian Westphal <fw@strlen.de> Reviewed-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <a@unstable.cc>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/routing.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index ae850f2d11cb..e3857ed4057f 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -601,6 +601,7 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
struct batadv_unicast_packet *unicast_packet;
struct ethhdr *ethhdr = eth_hdr(skb);
int res, hdr_len, ret = NET_RX_DROP;
+ unsigned int len;
unicast_packet = (struct batadv_unicast_packet *)skb->data;
@@ -641,6 +642,7 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
if (hdr_len > 0)
batadv_skb_set_priority(skb, hdr_len);
+ len = skb->len;
res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
/* translate transmit result into receive result */
@@ -648,7 +650,7 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
/* skb was transmitted and consumed */
batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
- skb->len + ETH_HLEN);
+ len + ETH_HLEN);
ret = NET_RX_SUCCESS;
} else if (res == NET_XMIT_POLICED) {