linux-kernel - [PATCH AUTOSEL 5.4 18/73] HSI: core: Fix return freed object in hsi_new

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Message-Id: <20220118024432.1952028-18-sashal@kernel.org>
Date:   Mon, 17 Jan 2022 21:43:37 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Chengfeng Ye <cyeaa@...nect.ust.hk>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Sasha Levin <sashal@...nel.org>, sre@...nel.org
Subject: [PATCH AUTOSEL 5.4 18/73] HSI: core: Fix return freed object in hsi_new_client

From: Chengfeng Ye <cyeaa@...nect.ust.hk>

[ Upstream commit a1ee1c08fcd5af03187dcd41dcab12fd5b379555 ]

cl is freed on error of calling device_register, but this
object is return later, which will cause uaf issue. Fix it
by return NULL on error.

Signed-off-by: Chengfeng Ye <cyeaa@...nect.ust.hk>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hsi/hsi_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hsi/hsi_core.c b/drivers/hsi/hsi_core.c
index a5f92e2889cb8..a330f58d45fc6 100644
--- a/drivers/hsi/hsi_core.c
+++ b/drivers/hsi/hsi_core.c
@@ -102,6 +102,7 @@ struct hsi_client *hsi_new_client(struct hsi_port *port,
 	if (device_register(&cl->device) < 0) {
 		pr_err("hsi: failed to register client: %s\n", info->name);
 		put_device(&cl->device);
+		goto err;
 	}
 
 	return cl;
-- 
2.34.1