From: Chengfeng Ye <cyeaa@connect.ust.hk>
Date: Fri, 5 Nov 2021 13:45:07 +0000 (-0700)
Subject: HSI: core: Fix return freed object in hsi_new_client
X-Git-Tag: v4.9.298~76
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fd95bb02e0fbed1852fcd746eee736a187c7cdd5;p=thirdparty%2Fkernel%2Fstable.git

HSI: core: Fix return freed object in hsi_new_client

[ 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@connect.ust.hk>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/hsi/hsi_core.c b/drivers/hsi/hsi_core.c
index e9d63b966caff..4a9fd745b8cb4 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;