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Date: Sun, 15 May 2016 23:11:30 +0800 From: Antonio Quartulli <a@...table.cc> To: davem@...emloft.net Cc: netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org, Florian Westphal <fw@...len.de>, Marek Lindner <mareklindner@...mailbox.ch>, Antonio Quartulli <a@...table.cc> Subject: [PATCH 1/4] batman-adv: fix skb deref after free From: Florian Westphal <fw@...len.de> 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@...len.de> Reviewed-by: Sven Eckelmann <sven@...fation.org> Signed-off-by: Marek Lindner <mareklindner@...mailbox.ch> Signed-off-by: Antonio Quartulli <a@...table.cc> --- net/batman-adv/routing.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index b781bf753250..0c0c30e101a1 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) { -- 2.8.2
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