linux-kernel - [PATCH AUTOSEL 6.13 10/22] HSI: ssi_protocol: Fix use after free vulnerability in ssi

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Message-Id: <20250404000453.2688371-10-sashal@kernel.org>
Date: Thu,  3 Apr 2025 20:04:39 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Kaixin Wang <kxwang23@...udan.edu.cn>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	Sasha Levin <sashal@...nel.org>,
	sre@...nel.org
Subject: [PATCH AUTOSEL 6.13 10/22] HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition

From: Kaixin Wang <kxwang23@...udan.edu.cn>

[ Upstream commit e3f88665a78045fe35c7669d2926b8d97b892c11 ]

In the ssi_protocol_probe() function, &ssi->work is bound with
ssip_xmit_work(), In ssip_pn_setup(), the ssip_pn_xmit() function
within the ssip_pn_ops structure is capable of starting the
work.

If we remove the module which will call ssi_protocol_remove()
to make a cleanup, it will free ssi through kfree(ssi),
while the work mentioned above will be used. The sequence
of operations that may lead to a UAF bug is as follows:

CPU0                                    CPU1

                        | ssip_xmit_work
ssi_protocol_remove     |
kfree(ssi);             |
                        | struct hsi_client *cl = ssi->cl;
                        | // use ssi

Fix it by ensuring that the work is canceled before proceeding
with the cleanup in ssi_protocol_remove().

Signed-off-by: Kaixin Wang <kxwang23@...udan.edu.cn>
Acked-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Link: https://lore.kernel.org/r/20240918120749.1730-1-kxwang23@m.fudan.edu.cn
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hsi/clients/ssi_protocol.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hsi/clients/ssi_protocol.c b/drivers/hsi/clients/ssi_protocol.c
index afe470f3661c7..6105ea9a6c6aa 100644
--- a/drivers/hsi/clients/ssi_protocol.c
+++ b/drivers/hsi/clients/ssi_protocol.c
@@ -401,6 +401,7 @@ static void ssip_reset(struct hsi_client *cl)
 	del_timer(&ssi->rx_wd);
 	del_timer(&ssi->tx_wd);
 	del_timer(&ssi->keep_alive);
+	cancel_work_sync(&ssi->work);
 	ssi->main_state = 0;
 	ssi->send_state = 0;
 	ssi->recv_state = 0;
-- 
2.39.5