[PATCH 6.11 735/817] netdev-genl: Hold rcu_read_lock in napi_get

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6.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joe Damato <jdamato@xxxxxxxxxx>

commit c53bf100f68619acf6cedcf4cf5249a1ca2db0b4 upstream.

Hold rcu_read_lock in netdev_nl_napi_get_doit, which calls napi_by_id
and is required to be called under rcu_read_lock.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi")
Signed-off-by: Joe Damato <jdamato@xxxxxxxxxx>
Link: https://patch.msgid.link/20241114175157.16604-1-jdamato@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/core/netdev-genl.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -214,6 +214,7 @@ int netdev_nl_napi_get_doit(struct sk_bu
 		return -ENOMEM;
 
 	rtnl_lock();
+	rcu_read_lock();
 
 	napi = napi_by_id(napi_id);
 	if (napi) {
@@ -223,6 +224,7 @@ int netdev_nl_napi_get_doit(struct sk_bu
 		err = -ENOENT;
 	}
 
+	rcu_read_unlock();
 	rtnl_unlock();
 
 	if (err)






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