batman-adv: release vlan object after checking the CRC

[ Upstream commit 91c2b1a9f680ff105369d49abc7e19ca7efb33e1 ]

There is a refcounter unbalance in the CRC checking routine
invoked on OGM reception. A vlan object is retrieved (thus
its refcounter is increased by one) but it is never properly
released. This leads to a memleak because the vlan object
will never be free'd.

Fix this by releasing the vlan object after having read the
CRC.

Reported-by: Russell Senior <russell@personaltelco.net>
Reported-by: Daniel <daniel@makrotopia.org>
Reported-by: cmsv <cmsv@wirelesspt.net>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 5275921047b503c566108c017171f46e37ee0ded..2316130d8fd7614ad9553c17e4914c4a86680290 100644 (file)
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -2248,6 +2248,7 @@ static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
 {
        struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
        struct batadv_orig_node_vlan *vlan;
+       uint32_t crc;
        int i;
 
        /* check if each received CRC matches the locally stored one */
@@ -2267,7 +2268,10 @@ static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
                if (!vlan)
                        return false;
 
-               if (vlan->tt.crc != ntohl(tt_vlan_tmp->crc))
+               crc = vlan->tt.crc;
+               batadv_orig_node_vlan_free_ref(vlan);
+
+               if (crc != ntohl(tt_vlan_tmp->crc))
                        return false;
        }