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authorMarek Lindner <lindner_marek@yahoo.de>2011-04-20 15:40:58 +0200
committerSven Eckelmann <sven@narfation.org>2011-05-01 22:49:03 +0200
commit32ae9b221e788413ce68feaae2ca39e406211a0a (patch)
treed827f989976a28fea5cdcb349c308baa98182c35 /net/batman-adv/icmp_socket.c
parent71e4aa9c465fd66c110667ab5d620fb6a4ef2157 (diff)
downloadlinux-32ae9b221e788413ce68feaae2ca39e406211a0a.tar.bz2
batman-adv: Make bat_priv->primary_if an rcu protected pointer
The rcu protected macros rcu_dereference() and rcu_assign_pointer() for the bat_priv->primary_if need to be used, as well as spin/rcu locking. Otherwise we might end up using a primary_if pointer pointing to already freed memory. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
Diffstat (limited to 'net/batman-adv/icmp_socket.c')
-rw-r--r--net/batman-adv/icmp_socket.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index 49079c254476..fa22ba2bb832 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -153,6 +153,7 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
{
struct socket_client *socket_client = file->private_data;
struct bat_priv *bat_priv = socket_client->bat_priv;
+ struct hard_iface *primary_if = NULL;
struct sk_buff *skb;
struct icmp_packet_rr *icmp_packet;
@@ -167,15 +168,21 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
return -EINVAL;
}
- if (!bat_priv->primary_if)
- return -EFAULT;
+ primary_if = primary_if_get_selected(bat_priv);
+
+ if (!primary_if) {
+ len = -EFAULT;
+ goto out;
+ }
if (len >= sizeof(struct icmp_packet_rr))
packet_len = sizeof(struct icmp_packet_rr);
skb = dev_alloc_skb(packet_len + sizeof(struct ethhdr));
- if (!skb)
- return -ENOMEM;
+ if (!skb) {
+ len = -ENOMEM;
+ goto out;
+ }
skb_reserve(skb, sizeof(struct ethhdr));
icmp_packet = (struct icmp_packet_rr *)skb_put(skb, packet_len);
@@ -233,7 +240,7 @@ static ssize_t bat_socket_write(struct file *file, const char __user *buff,
goto dst_unreach;
memcpy(icmp_packet->orig,
- bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);
+ primary_if->net_dev->dev_addr, ETH_ALEN);
if (packet_len == sizeof(struct icmp_packet_rr))
memcpy(icmp_packet->rr,
@@ -248,6 +255,8 @@ dst_unreach:
free_skb:
kfree_skb(skb);
out:
+ if (primary_if)
+ hardif_free_ref(primary_if);
if (neigh_node)
neigh_node_free_ref(neigh_node);
if (orig_node)