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batman-adv: clear current gateway during teardown

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batadv_gw_node_free() removes the gateway list entries during mesh teardown,
but it does not clear the currently selected gateway. This leaves stale
gateway state behind across cleanup and can break a later mesh recreation.

Clear bat_priv->gw.curr_gw before walking the gateway list so the selected
gateway reference is dropped as part of teardown.

Fixes: 2265c14108 ("batman-adv: gateway election code refactoring")
Cc: stable@kernel.org
Reported-by: Yuan Tan <yuantan098@gmail.com>
Reported-by: Yifan Wu <yifanwucs@gmail.com>
Reported-by: Juefei Pu <tomapufckgml@gmail.com>
Reported-by: Xin Liu <bird@lzu.edu.cn>
Signed-off-by: Ruijie Li <ruijieli51@gmail.com>
Signed-off-by: Zhanpeng Li <lzhanpeng2025@lzu.edu.cn>
Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
This commit is contained in:
Ruijie Li
2026-05-14 18:48:40 +02:00
committed by Sven Eckelmann
parent 9cd3f16c32
commit a340a51ed8
1 changed files with 4 additions and 0 deletions
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net/batman-adv/gateway_client.c
+4
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@@ -478,10 +478,14 @@ void batadv_gw_node_delete(struct batadv_priv *bat_priv,
*/
void batadv_gw_node_free(struct batadv_priv *bat_priv)
{
struct batadv_gw_node *curr_gw;
struct batadv_gw_node *gw_node;
struct hlist_node *node_tmp;
spin_lock_bh(&bat_priv->gw.list_lock);
curr_gw = rcu_replace_pointer(bat_priv->gw.curr_gw, NULL, true);
batadv_gw_node_put(curr_gw);
hlist_for_each_entry_safe(gw_node, node_tmp,
&bat_priv->gw.gateway_list, list) {
hlist_del_init_rcu(&gw_node->list);