Patch "ax25: fix use-after-free bugs caused by ax25_ds_del_timer" has been added to the 6.6-stable tree

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

    ax25: fix use-after-free bugs caused by ax25_ds_del_timer

to the 6.6-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-use-after-free-bugs-caused-by-ax25_ds_del_timer.patch
and it can be found in the queue-6.6 subdirectory.

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


>From fd819ad3ecf6f3c232a06b27423ce9ed8c20da89 Mon Sep 17 00:00:00 2001
From: Duoming Zhou <duoming@xxxxxxxxxx>
Date: Fri, 29 Mar 2024 09:50:23 +0800
Subject: ax25: fix use-after-free bugs caused by ax25_ds_del_timer

From: Duoming Zhou <duoming@xxxxxxxxxx>

commit fd819ad3ecf6f3c232a06b27423ce9ed8c20da89 upstream.

When the ax25 device is detaching, the ax25_dev_device_down()
calls ax25_ds_del_timer() to cleanup the slave_timer. When
the timer handler is running, the ax25_ds_del_timer() that
calls del_timer() in it will return directly. As a result,
the use-after-free bugs could happen, one of the scenarios
is shown below:

      (Thread 1)          |      (Thread 2)
                          | ax25_ds_timeout()
ax25_dev_device_down()    |
  ax25_ds_del_timer()     |
    del_timer()           |
  ax25_dev_put() //FREE   |
                          |  ax25_dev-> //USE

In order to mitigate bugs, when the device is detaching, use
timer_shutdown_sync() to stop the timer.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Duoming Zhou <duoming@xxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240329015023.9223-1-duoming@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ax25/ax25_dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ax25/ax25_dev.c
+++ b/net/ax25/ax25_dev.c
@@ -105,7 +105,7 @@ void ax25_dev_device_down(struct net_dev
 	spin_lock_bh(&ax25_dev_lock);
 
 #ifdef CONFIG_AX25_DAMA_SLAVE
-	ax25_ds_del_timer(ax25_dev);
+	timer_shutdown_sync(&ax25_dev->dama.slave_timer);
 #endif
 
 	/*


Patches currently in stable-queue which might be from duoming@xxxxxxxxxx are

queue-6.6/ax25-fix-use-after-free-bugs-caused-by-ax25_ds_del_timer.patch




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