[B.A.T.M.A.N.] [PATCH-maint] batman-adv: Fix ICMP RR ethernet access after skb_linearize

Sven Eckelmann sven at narfation.org
Sun May 29 21:25:52 CEST 2016

The skb_linearize may reallocate the skb. This makes the calculated pointer
for ethhdr invalid. But it the pointer is used later to fill in the RR
field of the batadv_icmp_packet_rr packet.

Instead re-evaluate eth_hdr after the skb_linearize+skb_cow to fix the
pointer and avoid the invalid read.

Fixes: bb69cb678d37 ("batman-adv: generalize batman-adv icmp packet handling")
Signed-off-by: Sven Eckelmann <sven at narfation.org>
 net/batman-adv/routing.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 0c0c30e..27e07dd 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -374,6 +374,7 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 		if (skb_cow(skb, ETH_HLEN) < 0)
 			goto out;
+		ethhdr = eth_hdr(skb);
 		icmph = (struct batadv_icmp_header *)skb->data;
 		icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph;
 		if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN)

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