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net: Wrap default_device_exit_net() with __rtnl_net_lock().

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default_device_exit_net() could call dev_change_net_namespace()
to move devices from a dying netns to init_net.

Let's hold the two netns __rtnl_net_lock() around it.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260703001009.1572444-5-kuniyu@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Kuniyuki Iwashima
2026-07-03 00:09:15 +00:00
committed by Paolo Abeni
parent c6cfaf9783
commit 2b12ec2578
1 changed files with 9 additions and 1 deletions
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10
net/core/dev.c
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@@ -13039,7 +13039,7 @@ static void __net_exit default_device_exit_net(struct net *net)
* Push all migratable network devices back to the
* initial network namespace
*/
ASSERT_RTNL();
for_each_netdev_safe(net, dev, aux) {
int err;
char fb_name[IFNAMSIZ];
@@ -13082,11 +13082,19 @@ static void __net_exit default_device_exit_batch(struct list_head *net_list)
LIST_HEAD(dev_kill_list);
rtnl_lock();
__rtnl_net_lock(&init_net);
list_for_each_entry(net, net_list, exit_list) {
__rtnl_net_lock(net);
default_device_exit_net(net);
__rtnl_net_unlock(net);
cond_resched();
}
__rtnl_net_unlock(&init_net);
list_for_each_entry(net, net_list, exit_list) {
for_each_netdev_reverse(net, dev) {
if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)