[PATCH] RDMA/siw: remove namespace check from siw_netdev_event()

From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Bernard Metzler <bmt@zurich.ibm.com>,
	Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>
Cc: OFED mailing list <linux-rdma@vger.kernel.org>,
	syzbot+5e70d01ee8985ae62a3b@syzkaller.appspotmail.com,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: [PATCH] RDMA/siw: remove namespace check from siw_netdev_event()
Date: Sun, 2 Apr 2023 14:10:13 +0900	[thread overview]
Message-ID: <a44e9ac5-44e2-d575-9e30-02483cc7ffd1@I-love.SAKURA.ne.jp> (raw)

syzbot is reporting that siw_netdev_event(NETDEV_UNREGISTER) cannot destroy
siw_device created after unshare(CLONE_NEWNET) due to net namespace check.
It seems that this check was by error there and should be removed.

Reported-by: syzbot <syzbot+5e70d01ee8985ae62a3b@syzkaller.appspotmail.com>
Link: https://syzkaller.appspot.com/bug?extid=5e70d01ee8985ae62a3b
Suggested-by: Jason Gunthorpe <jgg@ziepe.ca>
Suggested-by: Leon Romanovsky <leon@kernel.org>
Fixes: bdcf26bf9b3a ("rdma/siw: network and RDMA core interface")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
---
 drivers/infiniband/sw/siw/siw_main.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/siw/siw_main.c
index dacc174604bf..65b5cda5457b 100644
--- a/drivers/infiniband/sw/siw/siw_main.c
+++ b/drivers/infiniband/sw/siw/siw_main.c
@@ -437,9 +437,6 @@ static int siw_netdev_event(struct notifier_block *nb, unsigned long event,
 
 	dev_dbg(&netdev->dev, "siw: event %lu\n", event);
 
-	if (dev_net(netdev) != &init_net)
-		return NOTIFY_OK;
-
 	base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW);
 	if (!base_dev)
 		return NOTIFY_OK;
-- 
2.18.4
