5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Dumazet edumazet@google.com
[ Upstream commit 48145a57d4bbe3496e8e4880b23ea6b511e6e519 ]
ndisc_send_redirect() is called under RCU protection, not RTNL.
It must use dev_get_by_index_rcu() instead of __dev_get_by_index()
Fixes: 2f17becfbea5 ("vrf: check the original netdevice for generating redirect") Signed-off-by: Eric Dumazet edumazet@google.com Cc: Stephen Suryaputra ssuryaextr@gmail.com Reviewed-by: David Ahern dsahern@kernel.org Reviewed-by: Kuniyuki Iwashima kuniyu@amazon.com Link: https://patch.msgid.link/20250207135841.1948589-2-edumazet@google.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv6/ndisc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 64729e7e6a866..3096807caecab 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1597,7 +1597,7 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) bool ret;
if (netif_is_l3_master(skb->dev)) { - dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); + dev = dev_get_by_index_rcu(dev_net(skb->dev), IPCB(skb)->iif); if (!dev) return; }