[v2,2/2] batman-adv: Fix refcnt leak in batadv_v_*
Commit Message
The functions batadv_neigh_ifinfo_get increase the reference counter of the
batadv_neigh_ifinfo. These have to be reduced again when the reference is
not used anymore to correctly free the objects.
Fixes: b05bbab5e1fc ("batman-adv: B.A.T.M.A.N. V - implement neighbor comparison API calls")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
v2: Add patch to reduce the reference counter of these functions
net/batman-adv/bat_v.c | 32 +++++++++++++++++++++++++-------
1 file changed, 25 insertions(+), 7 deletions(-)
Comments
Maybe it is better to rename the patch slightly.
batman-adv: Fix refcnt leak in batadv_v_neigh_*
But I will not resent the patch for only this change when not explicitly asked
for it.
Kind regards,
Sven
On Friday, May 06, 2016 11:43:39 Sven Eckelmann wrote:
> The functions batadv_neigh_ifinfo_get increase the reference counter of the
> batadv_neigh_ifinfo. These have to be reduced again when the reference is
> not used anymore to correctly free the objects.
>
> Fixes: b05bbab5e1fc ("batman-adv: B.A.T.M.A.N. V - implement neighbor
> comparison API calls") Signed-off-by: Sven Eckelmann <sven@narfation.org>
> ---
> v2: Add patch to reduce the reference counter of these functions
>
> net/batman-adv/bat_v.c | 32 +++++++++++++++++++++++++-------
> 1 file changed, 25 insertions(+), 7 deletions(-)
Applied in revision 650d41d.
Thanks,
Marek
@@ -265,14 +265,23 @@ static int batadv_v_neigh_cmp(struct batadv_neigh_node *neigh1,
struct batadv_hard_iface *if_outgoing2)
{
struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2;
+ int ret = 0;
ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
+ if (WARN_ON(!ifinfo1))
+ goto err_ifinfo1;
+
ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
+ if (WARN_ON(!ifinfo2))
+ goto err_ifinfo2;
- if (WARN_ON(!ifinfo1 || !ifinfo2))
- return 0;
+ ret = ifinfo1->bat_v.throughput - ifinfo2->bat_v.throughput;
- return ifinfo1->bat_v.throughput - ifinfo2->bat_v.throughput;
+ batadv_neigh_ifinfo_put(ifinfo2);
+err_ifinfo2:
+ batadv_neigh_ifinfo_put(ifinfo1);
+err_ifinfo1:
+ return ret;
}
static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1,
@@ -282,17 +291,26 @@ static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1,
{
struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2;
u32 threshold;
+ bool ret = false;
ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
- ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
+ if (WARN_ON(!ifinfo1))
+ goto err_ifinfo1;
- if (WARN_ON(!ifinfo1 || !ifinfo2))
- return false;
+ ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
+ if (WARN_ON(!ifinfo2))
+ goto err_ifinfo2;
threshold = ifinfo1->bat_v.throughput / 4;
threshold = ifinfo1->bat_v.throughput - threshold;
- return ifinfo2->bat_v.throughput > threshold;
+ ret = ifinfo2->bat_v.throughput > threshold;
+
+ batadv_neigh_ifinfo_put(ifinfo2);
+err_ifinfo2:
+ batadv_neigh_ifinfo_put(ifinfo1);
+err_ifinfo1:
+ return ret;
}
static struct batadv_algo_ops batadv_batman_v __read_mostly = {