[PATCH 11/14] batman-adv: protect tt request from double deletion
From: Antonio Quartulli <hidden>
Date: 2015-08-04 16:54:49
Subsystem:
batman advanced, the rest · Maintainers:
Marek Lindner, Simon Wunderlich, Antonio Quartulli, Sven Eckelmann, Linus Torvalds
From: Marek Lindner <redacted> The list_del() calls were changed to list_del_init() to prevent an accidental double deletion in batadv_tt_req_node_new(). Signed-off-by: Marek Lindner <redacted> Signed-off-by: Antonio Quartulli <redacted> --- net/batman-adv/translation-table.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index cb2a2d1..db06de2 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c@@ -2213,7 +2213,7 @@ static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) spin_lock_bh(&bat_priv->tt.req_list_lock); list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { - list_del(&node->list); + list_del_init(&node->list); kfree(node); }
@@ -2249,7 +2249,7 @@ static void batadv_tt_req_purge(struct batadv_priv *bat_priv) list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { if (batadv_has_timed_out(node->issued_at, BATADV_TT_REQUEST_TIMEOUT)) { - list_del(&node->list); + list_del_init(&node->list); kfree(node); } }
@@ -2531,7 +2531,8 @@ out: batadv_hardif_free_ref(primary_if); if (ret && tt_req_node) { spin_lock_bh(&bat_priv->tt.req_list_lock); - list_del(&tt_req_node->list); + /* list_del_init() verifies tt_req_node still is in the list */ + list_del_init(&tt_req_node->list); spin_unlock_bh(&bat_priv->tt.req_list_lock); kfree(tt_req_node); }
@@ -2968,7 +2969,7 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv, list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { if (!batadv_compare_eth(node->addr, resp_src)) continue; - list_del(&node->list); + list_del_init(&node->list); kfree(node); }
--
2.5.0