Patch "RDMA/siw: Remove namespace check from siw_netdev_event()" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    RDMA/siw: Remove namespace check from siw_netdev_event()

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     rdma-siw-remove-namespace-check-from-siw_netdev_even.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 70db394a3074e316f5b39a84e50ca65cd6d0b775
Author: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Date:   Sun Apr 2 14:10:13 2023 +0900

    RDMA/siw: Remove namespace check from siw_netdev_event()
    
    [ Upstream commit 266e9b3475ba82212062771fdbc40be0e3c06ec8 ]
    
    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@xxxxxxxxxxxxxxxxxxxxxxxxx>
    Link: https://syzkaller.appspot.com/bug?extid=5e70d01ee8985ae62a3b
    Suggested-by: Jason Gunthorpe <jgg@xxxxxxxx>
    Suggested-by: Leon Romanovsky <leon@xxxxxxxxxx>
    Fixes: bdcf26bf9b3a ("rdma/siw: network and RDMA core interface")
    Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/a44e9ac5-44e2-d575-9e30-02483cc7ffd1@xxxxxxxxxxxxxxxxxxx
    Reviewed-by: Bernard Metzler <bmt@xxxxxxxxxxxxxx>
    Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/siw/siw_main.c
index 9093e6a80b260..f853f3c23540a 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;



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