Patch "ax25: Replace kfree() in ax25_dev_free() with ax25_dev_put()" has been added to the 6.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    ax25: Replace kfree() in ax25_dev_free() with ax25_dev_put()

to the 6.9-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-replace-kfree-in-ax25_dev_free-with-ax25_dev_pu.patch
and it can be found in the queue-6.9 subdirectory.

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



commit d995df1ec95cc67e5ba7085df4fce93c8085dd41
Author: Duoming Zhou <duoming@xxxxxxxxxx>
Date:   Thu May 30 13:17:33 2024 +0800

    ax25: Replace kfree() in ax25_dev_free() with ax25_dev_put()
    
    [ Upstream commit 166fcf86cd34e15c7f383eda4642d7a212393008 ]
    
    The object "ax25_dev" is managed by reference counting. Thus it should
    not be directly released by kfree(), replace with ax25_dev_put().
    
    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/20240530051733.11416-1-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 c9d55b99a7a57..67ae6b8c52989 100644
--- a/net/ax25/ax25_dev.c
+++ b/net/ax25/ax25_dev.c
@@ -193,7 +193,7 @@ void __exit ax25_dev_free(void)
 	list_for_each_entry_safe(s, n, &ax25_dev_list, list) {
 		netdev_put(s->dev, &s->dev_tracker);
 		list_del(&s->list);
-		kfree(s);
+		ax25_dev_put(s);
 	}
 	spin_unlock_bh(&ax25_dev_lock);
 }