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  1. 29 6月, 2016 1 次提交
  3. 10 5月, 2016 2 次提交
  5. 04 5月, 2016 2 次提交
  7. 29 4月, 2016 1 次提交
    • S
      batman-adv: Fix reference counting of vlan object for tt_local_entry · a33d970d
      由 Sven Eckelmann 提交于 
      The batadv_tt_local_entry was specific to a batadv_softif_vlan and held an
implicit reference to it. But this reference was never stored in form of a
pointer in the tt_local_entry itself. Instead batadv_tt_local_remove,
batadv_tt_local_table_free and batadv_tt_local_purge_pending_clients depend
on a consistent state of bat_priv->softif_vlan_list and that
batadv_softif_vlan_get always returns the batadv_softif_vlan object which
it has a reference for. But batadv_softif_vlan_get cannot guarantee that
because it is working only with rcu_read_lock on this list. It can
therefore happen that an vid is in this list twice or that
batadv_softif_vlan_get cannot find the batadv_softif_vlan for an vid due to
some other list operations taking place at the same time.

Instead add a batadv_softif_vlan pointer directly in batadv_tt_local_entry
which will be used for the reference counter decremented on release of
batadv_tt_local_entry.

Fixes: 35df3b29 ("batman-adv: fix TT VLAN inconsistency on VLAN re-add")
Signed-off-by: NSven Eckelmann <sven@narfation.org>
Acked-by: NAntonio Quartulli <a@unstable.cc>
Signed-off-by: NMarek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: NAntonio Quartulli <a@unstable.cc>
      a33d970d
  9. 23 2月, 2016 8 次提交
  11. 16 2月, 2016 1 次提交
    • S
      batman-adv: Only put orig_node_vlan list reference when removed · 3db15209
      由 Sven Eckelmann 提交于 
      The batadv_orig_node_vlan reference counter in batadv_tt_global_size_mod
can only be reduced when the list entry was actually removed. Otherwise the
reference counter may reach zero when batadv_tt_global_size_mod is called
from two different contexts for the same orig_node_vlan but only one
context is actually removing the entry from the list.

The release function for this orig_node_vlan is not called inside the
vlan_list_lock spinlock protected region because the function
batadv_tt_global_size_mod still holds a orig_node_vlan reference for the
object pointer on the stack. Thus the actual release function (when
required) will be called only at the end of the function.

Fixes: 7ea7b4a1 ("batman-adv: make the TT CRC logic VLAN specific")
Signed-off-by: NSven Eckelmann <sven@narfation.org>
Signed-off-by: NMarek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: NAntonio Quartulli <a@unstable.cc>
      3db15209
  13. 10 2月, 2016 3 次提交
  15. 02 2月, 2016 5 次提交
  17. 16 1月, 2016 1 次提交
    • S
      batman-adv: Drop immediate orig_node free function · 42eff6a6
      由 Sven Eckelmann 提交于 
      It is not allowed to free the memory of an object which is part of a list
which is protected by rcu-read-side-critical sections without making sure
that no other context is accessing the object anymore. This usually happens
by removing the references to this object and then waiting until the rcu
grace period is over and no one (allowedly) accesses it anymore.

But the _now functions ignore this completely. They free the object
directly even when a different context still tries to access it. This has
to be avoided and thus these functions must be removed and all functions
have to use batadv_orig_node_free_ref.

Fixes: 72822225 ("batman-adv: Fix rcu_barrier() miss due to double call_rcu() in TT code")
Signed-off-by: NSven Eckelmann <sven@narfation.org>
Signed-off-by: NMarek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: NAntonio Quartulli <a@unstable.cc>
      42eff6a6
  19. 09 1月, 2016 2 次提交
  21. 16 12月, 2015 2 次提交
  23. 07 12月, 2015 2 次提交
  25. 25 8月, 2015 9 次提交
  27. 19 8月, 2015 1 次提交
    • S
      batman-adv: Fix memory leak on tt add with invalid vlan · fd7dec25
      由 Sven Eckelmann 提交于 
      The object tt_local is allocated with kmalloc and not initialized when the
function batadv_tt_local_add checks for the vlan. But this function can
only cleanup the object when the (not yet initialized) reference counter of
the object is 1. This is unlikely and thus the object would leak when the
vlan could not be found.

Instead the uninitialized object tt_local has to be freed manually and the
pointer has to set to NULL to avoid calling the function which would try to
decrement the reference counter of the not existing object.

CID: 1316518
Fixes: 354136bc ("batman-adv: fix kernel crash due to missing NULL checks")
Signed-off-by: NSven Eckelmann <sven@narfation.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      fd7dec25