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

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Message-Id: <20240703155153.83500-1-aha310510@gmail.com>
Date: Thu,  4 Jul 2024 00:51:53 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+705c61d60b091ef42c04@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] possible deadlock in team_del_slave (3)

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

---
 drivers/net/team/team_core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/team/team_core.c b/drivers/net/team/team_core.c
index ab1935a4aa2c..43d7c73b25aa 100644
--- a/drivers/net/team/team_core.c
+++ b/drivers/net/team/team_core.c
@@ -1972,7 +1972,8 @@ static int team_add_slave(struct net_device *dev, struct net_device *port_dev,
        struct team *team = netdev_priv(dev);
        int err;
 
-       mutex_lock(&team->lock);
+       if (!mutex_trylock(&team->lock))
+               return -EBUSY;
        err = team_port_add(team, port_dev, extack);
        mutex_unlock(&team->lock);
 
@@ -1987,7 +1988,8 @@ static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
        struct team *team = netdev_priv(dev);
        int err;
 
-       mutex_lock(&team->lock);
+       if (!mutex_trylock(&team->lock))
+               return -EBUSY;
        err = team_port_del(team, port_dev);
        mutex_unlock(&team->lock);
 
--