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ipv4: use rcu_assign_pointer() in rt_flush_dev()

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rt_flush_dev() replaces rt->dst.dev with blackhole_netdev on uncached
routes.  The field is also exposed as dst.dev_rcu, and existing readers
use dst_dev_rcu().

Use rcu_assign_pointer() for the replacement, as dst_dev_put() already
does for the same field.

Signed-off-by: Xuanqiang Luo <luoxuanqiang@kylinos.cn>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260708060537.17188-2-xuanqiang.luo@linux.dev
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Xuanqiang Luo 2026-07-08 14:05:36 +08:00 committed by Paolo Abeni
parent b9ecdfda4d
commit 1469773b24
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/route.c
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@ -1565,7 +1565,7 @@ void rt_flush_dev(struct net_device *dev)
list_for_each_entry_safe(rt, safe, &ul->head, dst.rt_uncached) {
if (rt->dst.dev != dev)
continue;
rt->dst.dev = blackhole_netdev;
rcu_assign_pointer(rt->dst.dev_rcu, blackhole_netdev);
netdev_ref_replace(dev, blackhole_netdev,
&rt->dst.dev_tracker, GFP_ATOMIC);
list_del_init(&rt->dst.rt_uncached);