linux-kernel - [PATCH net-next] tun: add missing rcu annotation in tun_set

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Message-Id: <20200731041720.61187-1-jasowang@redhat.com>
Date:   Fri, 31 Jul 2020 00:17:20 -0400
From:   Jason Wang <jasowang@...hat.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        mst@...hat.com, Jason Wang <jasowang@...hat.com>
Subject: [PATCH net-next] tun: add missing rcu annotation in tun_set_ebpf()

We expecte prog_p to be protected by rcu, so adding the rcu annotation
to fix the following sparse warning:

drivers/net/tun.c:3003:36: warning: incorrect type in argument 2 (different address spaces)
drivers/net/tun.c:3003:36:    expected struct tun_prog [noderef] __rcu **prog_p
drivers/net/tun.c:3003:36:    got struct tun_prog **prog_p
drivers/net/tun.c:3292:42: warning: incorrect type in argument 2 (different address spaces)
drivers/net/tun.c:3292:42:    expected struct tun_prog **prog_p
drivers/net/tun.c:3292:42:    got struct tun_prog [noderef] __rcu **
drivers/net/tun.c:3296:42: warning: incorrect type in argument 2 (different address spaces)
drivers/net/tun.c:3296:42:    expected struct tun_prog **prog_p
drivers/net/tun.c:3296:42:    got struct tun_prog [noderef] __rcu **

Reported-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/net/tun.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 7adeb91bd368..9b4b25358f9b 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2983,7 +2983,7 @@ static int tun_set_queue(struct file *file, struct ifreq *ifr)
 	return ret;
 }
 
-static int tun_set_ebpf(struct tun_struct *tun, struct tun_prog **prog_p,
+static int tun_set_ebpf(struct tun_struct *tun, struct tun_prog __rcu **prog_p,
 			void __user *data)
 {
 	struct bpf_prog *prog;
-- 
2.18.1