Patch "ax25: Fix reference count leak issue of net_device" has been added to the 6.1-stable tree

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

    ax25: Fix reference count leak issue of net_device

to the 6.1-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:
     ax25-fix-reference-count-leak-issue-of-net_device.patch
and it can be found in the queue-6.1 subdirectory.

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



commit 7bbd7abfbb52f4d18682d081017e659540f557d1
Author: Duoming Zhou <duoming@xxxxxxxxxx>
Date:   Thu May 9 17:37:02 2024 +0800

    ax25: Fix reference count leak issue of net_device
    
    [ Upstream commit 36e56b1b002bb26440403053f19f9e1a8bc075b2 ]
    
    There is a reference count leak issue of the object "net_device" in
    ax25_dev_device_down(). When the ax25 device is shutting down, the
    ax25_dev_device_down() drops the reference count of net_device one
    or zero times depending on if we goto unlock_put or not, which will
    cause memory leak.
    
    In order to solve the above issue, decrease the reference count of
    net_device after dev->ax25_ptr is set to null.
    
    Fixes: d01ffb9eee4a ("ax25: add refcount in ax25_dev to avoid UAF bugs")
    Suggested-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
    Signed-off-by: Duoming Zhou <duoming@xxxxxxxxxx>
    Reviewed-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/7ce3b23a40d9084657ba1125432f0ecc380cbc80.1715247018.git.duoming@xxxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/ax25/ax25_dev.c b/net/ax25/ax25_dev.c
index dd1d616dab367..fcc64645bbf5e 100644
--- a/net/ax25/ax25_dev.c
+++ b/net/ax25/ax25_dev.c
@@ -118,15 +118,10 @@ void ax25_dev_device_down(struct net_device *dev)
 	list_for_each_entry(s, &ax25_dev_list, list) {
 		if (s == ax25_dev) {
 			list_del(&s->list);
-			goto unlock_put;
+			break;
 		}
 	}
-	dev->ax25_ptr = NULL;
-	spin_unlock_bh(&ax25_dev_lock);
-	ax25_dev_put(ax25_dev);
-	return;
 
-unlock_put:
 	dev->ax25_ptr = NULL;
 	spin_unlock_bh(&ax25_dev_lock);
 	netdev_put(dev, &ax25_dev->dev_tracker);




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