From: Antonio Quartulli <antonio@meshcoding.com>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, b.a.t.m.a.n@lists.open-mesh.org,
Marek Lindner <mareklindner@neomailbox.ch>,
Antonio Quartulli <antonio@meshcoding.com>
Subject: [B.A.T.M.A.N.] [PATCH 2/4] batman-adv: fix kernel crash due to missing NULL checks
Date: Wed, 5 Aug 2015 14:51:45 +0200 [thread overview]
Message-ID: <1438779107-12665-3-git-send-email-antonio@meshcoding.com> (raw)
In-Reply-To: <1438779107-12665-1-git-send-email-antonio@meshcoding.com>
From: Marek Lindner <mareklindner@neomailbox.ch>
batadv_softif_vlan_get() may return NULL which has to be verified
by the caller.
Fixes: 35df3b298fc8 ("batman-adv: fix TT VLAN inconsistency on VLAN re-add")
Reported-by: Ryan Thompson <ryan@eero.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
---
net/batman-adv/soft-interface.c | 3 +++
net/batman-adv/translation-table.c | 18 ++++++++++++++----
2 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index c002961..a2fc843 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -479,6 +479,9 @@ out:
*/
void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan)
{
+ if (!vlan)
+ return;
+
if (atomic_dec_and_test(&vlan->refcount)) {
spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock);
hlist_del_rcu(&vlan->list);
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index b482495..38b83c5 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -594,6 +594,9 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
/* increase the refcounter of the related vlan */
vlan = batadv_softif_vlan_get(bat_priv, vid);
+ if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
+ addr, BATADV_PRINT_VID(vid)))
+ goto out;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
@@ -1066,6 +1069,9 @@ uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
/* decrease the reference held for this vlan */
vlan = batadv_softif_vlan_get(bat_priv, vid);
+ if (!vlan)
+ goto out;
+
batadv_softif_vlan_free_ref(vlan);
batadv_softif_vlan_free_ref(vlan);
@@ -1166,8 +1172,10 @@ static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
/* decrease the reference held for this vlan */
vlan = batadv_softif_vlan_get(bat_priv,
tt_common_entry->vid);
- batadv_softif_vlan_free_ref(vlan);
- batadv_softif_vlan_free_ref(vlan);
+ if (vlan) {
+ batadv_softif_vlan_free_ref(vlan);
+ batadv_softif_vlan_free_ref(vlan);
+ }
batadv_tt_local_entry_free_ref(tt_local);
}
@@ -3207,8 +3215,10 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
/* decrease the reference held for this vlan */
vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
- batadv_softif_vlan_free_ref(vlan);
- batadv_softif_vlan_free_ref(vlan);
+ if (vlan) {
+ batadv_softif_vlan_free_ref(vlan);
+ batadv_softif_vlan_free_ref(vlan);
+ }
batadv_tt_local_entry_free_ref(tt_local);
}
--
2.5.0
next prev parent reply other threads:[~2015-08-05 12:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-05 12:51 [B.A.T.M.A.N.] pull request [net]: batman-adv fixes 20150805 Antonio Quartulli
2015-08-05 12:51 ` [B.A.T.M.A.N.] [PATCH 1/4] batman-adv: avoid DAT to mess up LAN state Antonio Quartulli
2015-08-05 12:51 ` Antonio Quartulli [this message]
2015-08-05 13:15 ` [B.A.T.M.A.N.] [PATCH 2/4] batman-adv: fix kernel crash due to missing NULL checks David Laight
2015-08-11 16:42 ` Antonio Quartulli
2015-08-12 8:44 ` David Laight
2015-08-05 12:51 ` [B.A.T.M.A.N.] [PATCH 3/4] batman-adv: protect tt_local_entry from concurrent delete events Antonio Quartulli
2015-08-05 12:51 ` [B.A.T.M.A.N.] [PATCH 4/4] batman-adv: initialize up/down values when adding a gateway Antonio Quartulli
2015-08-07 22:51 ` [B.A.T.M.A.N.] pull request [net]: batman-adv fixes 20150805 David Miller
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