diff mbox series

[net-next] sit: proper dev_{hold|put} in ndo_[un]init methods

Message ID 20210329192522.155336-1-eric.dumazet@gmail.com
State New
Headers show
Series [net-next] sit: proper dev_{hold|put} in ndo_[un]init methods | expand

Commit Message

Eric Dumazet March 29, 2021, 7:25 p.m. UTC 
From: Eric Dumazet <edumazet@google.com>

After adopting CONFIG_PCPU_DEV_REFCNT=n option, syzbot was able to trigger
a warning [1]

Issue here is that:

- all dev_put() should be paired with a corresponding prior dev_hold().

- A driver doing a dev_put() in its ndo_uninit() MUST also
  do a dev_hold() in its ndo_init(), only when ndo_init()
  is returning 0.

Otherwise, register_netdevice() would call ndo_uninit()
in its error path and release a refcount too soon.

Fixes: 919067cc845f ("net: add CONFIG_PCPU_DEV_REFCNT")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
---
 net/ipv6/sit.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index b9bd2723f89a314d15c8c4ea785e84530c8acb95..488d3181aec3a5558dbefb6145400627535df761 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -218,8 +218,6 @@  static int ipip6_tunnel_create(struct net_device *dev)
 
 	ipip6_tunnel_clone_6rd(dev, sitn);
 
-	dev_hold(dev);
-
 	ipip6_tunnel_link(sitn, t);
 	return 0;
 
@@ -1456,7 +1454,7 @@  static int ipip6_tunnel_init(struct net_device *dev)
 		dev->tstats = NULL;
 		return err;
 	}
-
+	dev_hold(dev);
 	return 0;
 }