linux-kernel - [PATCH net v3] netdev-genl: Hold rcu_read_lock in napi

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Message-Id: <20241114175157.16604-1-jdamato@fastly.com>
Date: Thu, 14 Nov 2024 17:51:56 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: pabeni@...hat.com,
	edumazet@...gle.com,
	amritha.nambiar@...el.com,
	sridhar.samudrala@...el.com,
	kuba@...nel.org,
	mkarsten@...terloo.ca,
	Joe Damato <jdamato@...tly.com>,
	stable@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Simon Horman <horms@...nel.org>,
	Mina Almasry <almasrymina@...gle.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net v3] netdev-genl: Hold rcu_read_lock in napi_get

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@...r.kernel.org
Fixes: 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi")
Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 v3:
   - Separate the patches that were a series in v2 (and earlier) as
     they target different trees.

 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 1cb954f2d39e..d2baa1af9df0 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -215,6 +215,7 @@ 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) {
@@ -224,6 +225,7 @@ int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info)
 		err = -ENOENT;
 	}
 
+	rcu_read_unlock();
 	rtnl_unlock();
 
 	if (err)

base-commit: 5b366eae71937ae7412365340b431064625f9617
-- 
2.25.1