This is a note to let you know that I've just added the patch titled
driver core: bus: Fix a potential double free
to the 4.4-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:
driver-core-bus-fix-a-potential-double-free.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0f9b011d3321ca1079c7a46c18cb1956fbdb7bcb Mon Sep 17 00:00:00 2001
From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Date: Tue, 29 Aug 2017 21:23:49 +0200
Subject: driver core: bus: Fix a potential double free
From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
commit 0f9b011d3321ca1079c7a46c18cb1956fbdb7bcb upstream.
The .release function of driver_ktype is 'driver_release()'.
This function frees the container_of this kobject.
So, this memory must not be freed explicitly in the error handling path of
'bus_add_driver()'. Otherwise a double free will occur.
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/bus.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -737,7 +737,7 @@ int bus_add_driver(struct device_driver
out_unregister:
kobject_put(&priv->kobj);
- kfree(drv->p);
+ /* drv->p is freed in driver_release() */
drv->p = NULL;
out_put_bus:
bus_put(bus);
Patches currently in stable-queue which might be from christophe.jaillet@xxxxxxxxxx are
queue-4.4/driver-core-bus-fix-a-potential-double-free.patch