linux-kernel - Re: [syzbot] Re: [syzbot] [net?] possible deadlock in team_device

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Message-ID: <0000000000004fe2ca061e8bbfb1@google.com>
Date: Wed, 31 Jul 2024 07:16:59 -0700
From: syzbot <syzbot+b668da2bc4cb9670bf58@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [net?] possible deadlock in
 team_device_event (3)

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

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

---
 drivers/net/team/team_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/team/team_core.c b/drivers/net/team/team_core.c
index ab1935a4aa2c..ee595c3c6624 100644
--- a/drivers/net/team/team_core.c
+++ b/drivers/net/team/team_core.c
@@ -1212,8 +1212,9 @@ static int team_port_add(struct team *team, struct net_device *port_dev,
 			   portname);
 		goto err_port_enter;
 	}
-
+	mutex_unlock(&team->lock);
 	err = dev_open(port_dev, extack);
+	mutex_lock(&team->lock);
 	if (err) {
 		netdev_dbg(dev, "Device %s opening failed\n",
 			   portname);
--