The following commit has been merged in the master branch: commit 202cfe106012c3917543ed8792be1affc37f107b Author: Sven Eckelmann sven.eckelmann@gmx.de Date: Fri May 7 21:47:27 2010 +0200

Staging: batman-adv: Update pointer to ethhdr after skb_copy

We must ensure that all pointer to a socket buffer are updated when we copy a socket buffer and free our reference to the old one. Another part of the kernel could also free its reference which maybe removes the buffer completely. In that situation we would would feed wrong information to the routing algorithm after the memory area is written again by someone else.

Signed-off-by: Sven Eckelmann sven.eckelmann@gmx.de Signed-off-by: Marek Lindner lindner_marek@yahoo.de Signed-off-by: Andrew Lunn andrew@lunn.ch Signed-off-by: Greg Kroah-Hartman gregkh@suse.de

diff --git a/drivers/staging/batman-adv/routing.c b/drivers/staging/batman-adv/routing.c index bf67059..919a4f8 100644 --- a/drivers/staging/batman-adv/routing.c +++ b/drivers/staging/batman-adv/routing.c @@ -614,6 +614,7 @@ int recv_bat_packet(struct sk_buff *skb, skb = skb_copy(skb, GFP_ATOMIC); if (!skb) return NET_RX_DROP; + ethhdr = (struct ethhdr *)skb_mac_header(skb); kfree_skb(skb_old); }

@@ -639,8 +640,8 @@ static int recv_my_icmp_packet(struct sk_buff *skb) unsigned long flags; uint8_t dstaddr[ETH_ALEN];

- icmp_packet = (struct icmp_packet *) skb->data; - ethhdr = (struct ethhdr *) skb_mac_header(skb); + icmp_packet = (struct icmp_packet *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb);

/* add data to device queue */ if (icmp_packet->msg_type != ECHO_REQUEST) { @@ -671,7 +672,9 @@ static int recv_my_icmp_packet(struct sk_buff *skb) skb = skb_copy(skb, GFP_ATOMIC); if (!skb) return NET_RX_DROP; - icmp_packet = (struct icmp_packet *) skb->data; + + icmp_packet = (struct icmp_packet *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); kfree_skb(skb_old); }

@@ -732,6 +735,7 @@ static int recv_icmp_ttl_exceeded(struct sk_buff *skb) if (!skb) return NET_RX_DROP; icmp_packet = (struct icmp_packet *) skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); kfree_skb(skb_old); }

@@ -780,7 +784,7 @@ int recv_icmp_packet(struct sk_buff *skb) if (!is_my_mac(ethhdr->h_dest)) return NET_RX_DROP;

- icmp_packet = (struct icmp_packet *) skb->data; + icmp_packet = (struct icmp_packet *)skb->data;

/* packet for me */ if (is_my_mac(icmp_packet->dst)) @@ -812,7 +816,8 @@ int recv_icmp_packet(struct sk_buff *skb) skb = skb_copy(skb, GFP_ATOMIC); if (!skb) return NET_RX_DROP; - icmp_packet = (struct icmp_packet *) skb->data; + icmp_packet = (struct icmp_packet *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); kfree_skb(skb_old); }

@@ -895,7 +900,8 @@ int recv_unicast_packet(struct sk_buff *skb) skb = skb_copy(skb, GFP_ATOMIC); if (!skb) return NET_RX_DROP; - unicast_packet = (struct unicast_packet *) skb->data; + unicast_packet = (struct unicast_packet *)skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); kfree_skb(skb_old); } /* decrement ttl */