Re: [syzbot] Re: [syzbot] [net?] possible deadlock in team_device_event (3)

[syzbot <syzbot+b668da2bc4cb9670bf58@syzkaller.appspotmail.com>]

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***

Subject: Re: [syzbot] [net?] possible deadlock in team_device_event (3)
Author: aha310510@gmail.com

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master 

---
 net/core/rtnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 87e67194f240..dc9f9c4dcb49 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2903,7 +2903,7 @@ static int do_setlink(const struct sk_buff *skb,
 			goto errout;
 	}
 
-	if (tb[IFLA_MASTER]) {
+	if (tb[IFLA_MASTER] && !(dev->flags & IFF_UP)) {
 		err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack);
 		if (err)
 			goto errout;
--