[PATCH 4.19 131/239] HSI: core: Fix return freed object in hsi_new_client

[Greg Kroah-Hartman]

From: Chengfeng Ye <cyeaa@xxxxxxxxxxxxxx>

[ 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@xxxxxxxxxxxxxx>
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 71895da63810b..daf2de837a30a 100644
--- a/drivers/hsi/hsi_core.c
+++ b/drivers/hsi/hsi_core.c
@@ -115,6 +115,7 @@ 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