[added to the v4.1 stable tree] driver core: bus: Fix a potential double free

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From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>

This patch has been added to the v4.1 stable tree. If you have any
objections, please let us know.

===============

[ Upstream commit 0f9b011d3321ca1079c7a46c18cb1956fbdb7bcb ]

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>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
 drivers/base/bus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 79bc203f51ef..07ea8608fb0b 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -722,7 +722,7 @@ int bus_add_driver(struct device_driver *drv)
 
 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);
-- 
2.11.0




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