linux-kernel - [PATCH] i2c: core: Fix possible memleak in i2c_new_client

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Date:   Fri, 15 Oct 2021 17:55:41 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-i2c@...r.kernel.org>
CC:     <wsa@...nel.org>
Subject: [PATCH] i2c: core: Fix possible memleak in i2c_new_client_device()

I got memory leak as follows when doing fault injection test:

unreferenced object 0xffff888014aec078 (size 8):
  comm "xrun", pid 356, jiffies 4294910619 (age 16.332s)
  hex dump (first 8 bytes):
    31 2d 30 30 31 63 00 00                          1-001c..
  backtrace:
    [<00000000eb56c0a9>] __kmalloc_track_caller+0x1a6/0x300
    [<000000000b220ea3>] kvasprintf+0xad/0x140
    [<00000000b83203e5>] kvasprintf_const+0x62/0x190
    [<000000002a5eab37>] kobject_set_name_vargs+0x56/0x140
    [<00000000300ac279>] dev_set_name+0xb0/0xe0
    [<00000000b66ebd6f>] i2c_new_client_device+0x7e4/0x9a0

In error path after calling i2c_dev_set_name(), the put_device()
should be used to give up the device reference, then the name
allocated in dev_set_name() will be freed in kobject_cleanup().

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/i2c/i2c-core-base.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 54964fbe3f03..190d4fd5e594 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1047,8 +1047,6 @@ i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *inf
 	client->dev.of_node = of_node_get(info->of_node);
 	client->dev.fwnode = info->fwnode;
 
-	i2c_dev_set_name(adap, client, info);
-
 	if (info->swnode) {
 		status = device_add_software_node(&client->dev, info->swnode);
 		if (status) {
@@ -1059,17 +1057,20 @@ i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *inf
 		}
 	}
 
+	i2c_dev_set_name(adap, client, info);
 	status = device_register(&client->dev);
-	if (status)
-		goto out_remove_swnode;
+	if (status) {
+		device_remove_software_node(&client->dev);
+		of_node_put(info->of_node);
+		put_device(&client->dev);
+		return ERR_PTR(status);
+	}
 
 	dev_dbg(&adap->dev, "client [%s] registered with bus id %s\n",
 		client->name, dev_name(&client->dev));
 
 	return client;
 
-out_remove_swnode:
-	device_remove_software_node(&client->dev);
 out_err_put_of_node:
 	of_node_put(info->of_node);
 out_err:
-- 
2.25.1