[PATCH AUTOSEL 5.4 5/5] greybus: Fix use-after-free bug in gb_interface_release due to race condition.

[Sasha Levin]

From: Sicong Huang <congei42@xxxxxxx>

[ Upstream commit 5c9c5d7f26acc2c669c1dcf57d1bb43ee99220ce ]

In gb_interface_create, &intf->mode_switch_completion is bound with
gb_interface_mode_switch_work. Then it will be started by
gb_interface_request_mode_switch. Here is the relevant code.
if (!queue_work(system_long_wq, &intf->mode_switch_work)) {
	...
}

If we call gb_interface_release to make cleanup, there may be an
unfinished work. This function will call kfree to free the object
"intf". However, if gb_interface_mode_switch_work is scheduled to
run after kfree, it may cause use-after-free error as
gb_interface_mode_switch_work will use the object "intf".
The possible execution flow that may lead to the issue is as follows:

CPU0                            CPU1

                            |   gb_interface_create
                            |   gb_interface_request_mode_switch
gb_interface_release        |
kfree(intf) (free)          |
                            |   gb_interface_mode_switch_work
                            |   mutex_lock(&intf->mutex) (use)

Fix it by canceling the work before kfree.

Signed-off-by: Sicong Huang <congei42@xxxxxxx>
Link: https://lore.kernel.org/r/20240416080313.92306-1-congei42@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/greybus/interface.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/greybus/interface.c b/drivers/greybus/interface.c
index 67dbe6fda9a13..5412031fb67c5 100644
--- a/drivers/greybus/interface.c
+++ b/drivers/greybus/interface.c
@@ -694,6 +694,7 @@ static void gb_interface_release(struct device *dev)
 
 	trace_gb_interface_release(intf);
 
+	cancel_work_sync(&intf->mode_switch_work);
 	kfree(intf);
 }
 
-- 
2.43.0