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@vger.kernel.org Fixes: 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi") Signed-off-by: Joe Damato jdamato@fastly.com --- v2: - Simplified by removing the helper and calling rcu_read_lock / unlock directly instead.

net/core/netdev-genl.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c index 765ce7c9d73b..0b684410b52d 100644 --- a/net/core/netdev-genl.c +++ b/net/core/netdev-genl.c @@ -233,6 +233,7 @@ int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info) return -ENOMEM;

rtnl_lock(); + rcu_read_lock();

napi = napi_by_id(napi_id); if (napi) { @@ -242,6 +243,7 @@ int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info) err = -ENOENT; }

+ rcu_read_unlock(); rtnl_unlock();

if (err)