geneve: Suppress list corruption splat in geneve_destroy_tunnels().

jira VULN-55939
cve-bf CVE-2025-21858
commit-author Kuniyuki Iwashima <kuniyu@amazon.com>
commit 62fab6e

As explained in the previous patch, iterating for_each_netdev() and
gn->geneve_list during ->exit_batch_rtnl() could trigger ->dellink()
twice for the same device.

If CONFIG_DEBUG_LIST is enabled, we will see a list_del() corruption
splat in the 2nd call of geneve_dellink().

Let's remove for_each_netdev() in geneve_destroy_tunnels() and delegate
that part to default_device_exit_batch().

Fixes: 9593172 ("geneve: Fix use-after-free in geneve_find_dev().")
	Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250217203705.40342-3-kuniyu@amazon.com
	Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit 62fab6e)
	Signed-off-by: CIQ Kernel Automation <ciq_kernel_automation@ciq.com>

Author: CIQ Kernel Automation

drivers/net/geneve.c

@@ -1918,14 +1918,7 @@ static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
 {
 	struct geneve_net *gn = net_generic(net, geneve_net_id);
 	struct geneve_dev *geneve, *next;
-	struct net_device *dev, *aux;
 
-	/* gather any geneve devices that were moved into this ns */
-	for_each_netdev_safe(net, dev, aux)
-		if (dev->rtnl_link_ops == &geneve_link_ops)
-			geneve_dellink(dev, head);
-
-	/* now gather any other geneve devices that were created in this ns */
 	list_for_each_entry_safe(geneve, next, &gn->geneve_list, next)
 		geneve_dellink(geneve->dev, head);
 }