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Included changes:

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- properly release neigh_ifinfo in batadv_iv_ogm_process_per_outif()
 - properly release orig_ifinfo->router when freeing orig_ifinfo
 - properly release neigh_node objects during periodic check
 - properly release neigh_info objects when the related hard_iface
   is free'd
 
 These changes are all very important because they fix some
 reference counting imbalances that lead to the
 impossibility of releasing the netdev object used by
 batman-adv on shutdown.
 The consequence is that such object cannot be destroyed by
 the networking stack (the refcounter does not reach zero)
 thus bringing the system in hanging state during a normal
 reboot operation or a network reconfiguration.
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Merge tag 'batman-adv-fix-for-davem' of git://git.open-mesh.org/linux-merge

Included changes:
- properly release neigh_ifinfo in batadv_iv_ogm_process_per_outif()
- properly release orig_ifinfo->router when freeing orig_ifinfo
- properly release neigh_node objects during periodic check
- properly release neigh_info objects when the related hard_iface
  is free'd

These changes are all very important because they fix some
reference counting imbalances that lead to the
impossibility of releasing the netdev object used by
batman-adv on shutdown.
The consequence is that such object cannot be destroyed by
the networking stack (the refcounter does not reach zero)
thus bringing the system in hanging state during a normal
reboot operation or a network reconfiguration.
This commit is contained in:
David S. Miller 2014-05-13 12:53:36 -04:00
commit 6262971a8a
2 changed files with 57 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/batman-adv/bat_iv_ogm.c
View File

@ -1545,6 +1545,8 @@ batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
if ((orig_neigh_node) && (!is_single_hop_neigh))
batadv_orig_node_free_ref(orig_neigh_node);
out:
if (router_ifinfo)
batadv_neigh_ifinfo_free_ref(router_ifinfo);
if (router)
batadv_neigh_node_free_ref(router);
if (router_router)

59
net/batman-adv/originator.c
View File

@ -501,12 +501,17 @@ batadv_neigh_node_get(const struct batadv_orig_node *orig_node,
static void batadv_orig_ifinfo_free_rcu(struct rcu_head *rcu)
{
struct batadv_orig_ifinfo *orig_ifinfo;
struct batadv_neigh_node *router;
orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu);
if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)
batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing);
/* this is the last reference to this object */
router = rcu_dereference_protected(orig_ifinfo->router, true);
if (router)
batadv_neigh_node_free_ref_now(router);
kfree(orig_ifinfo);
}
@ -701,6 +706,47 @@ struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
return NULL;
}
/**
* batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor
* @bat_priv: the bat priv with all the soft interface information
* @neigh: orig node which is to be checked
*/
static void
batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,
struct batadv_neigh_node *neigh)
{
struct batadv_neigh_ifinfo *neigh_ifinfo;
struct batadv_hard_iface *if_outgoing;
struct hlist_node *node_tmp;
spin_lock_bh(&neigh->ifinfo_lock);
/* for all ifinfo objects for this neighinator */
hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,
&neigh->ifinfo_list, list) {
if_outgoing = neigh_ifinfo->if_outgoing;
/* always keep the default interface */
if (if_outgoing == BATADV_IF_DEFAULT)
continue;
/* don't purge if the interface is not (going) down */
if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&
(if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&
(if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))
continue;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"neighbor/ifinfo purge: neighbor %pM, iface: %s\n",
neigh->addr, if_outgoing->net_dev->name);
hlist_del_rcu(&neigh_ifinfo->list);
batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
}
spin_unlock_bh(&neigh->ifinfo_lock);
}
/**
* batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator
* @bat_priv: the bat priv with all the soft interface information
@ -800,6 +846,11 @@ batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
hlist_del_rcu(&neigh_node->list);
batadv_neigh_node_free_ref(neigh_node);
} else {
/* only necessary if not the whole neighbor is to be
* deleted, but some interface has been removed.
*/
batadv_purge_neigh_ifinfo(bat_priv, neigh_node);
}
}
@ -857,7 +908,7 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
{
struct batadv_neigh_node *best_neigh_node;
struct batadv_hard_iface *hard_iface;
bool changed;
bool changed_ifinfo, changed_neigh;
if (batadv_has_timed_out(orig_node->last_seen,
2 * BATADV_PURGE_TIMEOUT)) {
@ -867,10 +918,10 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
jiffies_to_msecs(orig_node->last_seen));
return true;
}
changed = batadv_purge_orig_ifinfo(bat_priv, orig_node);
changed = changed || batadv_purge_orig_neighbors(bat_priv, orig_node);
changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);
changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);
if (!changed)
if (!changed_ifinfo && !changed_neigh)
return false;
/* first for NULL ... */