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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>
This commit is contained in:
Sven Eckelmann 2010-05-07 21:47:27 +02:00 committed by Greg Kroah-Hartman
parent 7d02d777d4
commit 202cfe1060
1 changed files with 12 additions and 6 deletions
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18
drivers/staging/batman-adv/routing.c
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@ -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 */