linux-kernel - [PATCH] HSI: core: Fix return freed object in hsi_new

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Message-Id: <20211105134507.31946-1-cyeaa@connect.ust.hk>
Date:   Fri,  5 Nov 2021 06:45:07 -0700
From:   Chengfeng Ye <cyeaa@...nect.ust.hk>
To:     sre@...nel.org
Cc:     linux-kernel@...r.kernel.org, Chengfeng Ye <cyeaa@...nect.ust.hk>
Subject: [PATCH] HSI: core: Fix return freed object in hsi_new_client

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>
---
 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 ec90713564e3..884066109699 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;
-- 
2.17.1