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authorAntonio Quartulli <antonio@open-mesh.com>2014-04-23 14:05:16 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-31 13:20:38 -0700
commite450a9b46e0d1c6d0b94a63d0d5fd4273d45de24 (patch)
tree6dec7c2f817976866ce49d1b74cedbc159ff002e
parentb6bc7a13cab3966f03d3efd79892c8d2f085b919 (diff)
batman-adv: fix reference counting imbalance while sending fragment
[ Upstream commit be181015a189cd141398b761ba4e79d33fe69949 ] In the new fragmentation code the batadv_frag_send_packet() function obtains a reference to the primary_if, but it does not release it upon return. This reference imbalance prevents the primary_if (and then the related netdevice) to be properly released on shut down. Fix this by releasing the primary_if in batadv_frag_send_packet(). Introduced by ee75ed88879af88558818a5c6609d85f60ff0df4 ("batman-adv: Fragment and send skbs larger than mtu") Cc: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Acked-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/batman-adv/fragmentation.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index 88df9b1d552d..cc1cfd60c094 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -418,12 +418,13 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
struct batadv_neigh_node *neigh_node)
{
struct batadv_priv *bat_priv;
- struct batadv_hard_iface *primary_if;
+ struct batadv_hard_iface *primary_if = NULL;
struct batadv_frag_packet frag_header;
struct sk_buff *skb_fragment;
unsigned mtu = neigh_node->if_incoming->net_dev->mtu;
unsigned header_size = sizeof(frag_header);
unsigned max_fragment_size, max_packet_size;
+ bool ret = false;
/* To avoid merge and refragmentation at next-hops we never send
* fragments larger than BATADV_FRAG_MAX_FRAG_SIZE
@@ -483,7 +484,11 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
skb->len + ETH_HLEN);
batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
- return true;
+ ret = true;
+
out_err:
- return false;
+ if (primary_if)
+ batadv_hardif_free_ref(primary_if);
+
+ return ret;
}