batman-adv: Drop immediate orig_node free function
[ Upstream commit 42eff6a617e23b691f8e4467f4687ed7245a92db ]
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: 72822225bd41 ("batman-adv: Fix rcu_barrier() miss due to double call_rcu() in TT code")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
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 76f19ba..83b0ca2 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -240,20 +240,6 @@
return count;
}
-static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
-{
- struct batadv_tt_orig_list_entry *orig_entry;
-
- orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
-
- /* We are in an rcu callback here, therefore we cannot use
- * batadv_orig_node_free_ref() and its call_rcu():
- * An rcu_barrier() wouldn't wait for that to finish
- */
- batadv_orig_node_free_ref_now(orig_entry->orig_node);
- kfree(orig_entry);
-}
-
/**
* batadv_tt_local_size_mod - change the size by v of the local table identified
* by vid
@@ -349,13 +335,25 @@
batadv_tt_global_size_mod(orig_node, vid, -1);
}
+/**
+ * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
+ * queue for free after rcu grace period
+ * @orig_entry: tt orig entry to be free'd
+ */
+static void
+batadv_tt_orig_list_entry_release(struct batadv_tt_orig_list_entry *orig_entry)
+{
+ batadv_orig_node_free_ref(orig_entry->orig_node);
+ kfree_rcu(orig_entry, rcu);
+}
+
static void
batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
{
if (!atomic_dec_and_test(&orig_entry->refcount))
return;
- call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
+ batadv_tt_orig_list_entry_release(orig_entry);
}
/**