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i2c: fix memleak in i2c_new_client_device()

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[ Upstream commit 6af79f7fe748fe6a3c5c3a63d7f35981a82c2769 ]

Yang Yingliang reported a memleak:
===

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

If device_register() returns error in i2c_new_client_device(),
the name allocated by i2c_dev_set_name() need be freed. As
comment of device_register() says, it should use put_device()
to give up the reference in the error path.

===
I think this solution is less intrusive and more robust than he
originally proposed solutions, though.

Reported-by: Yang Yingliang <yangyingliang@huawei.com>
Closes: http://patchwork.ozlabs.org/project/linux-i2c/patch/20221124085448.3620240-1-yangyingliang@huawei.com/
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wolfram Sang 2023-09-29 11:19:52 +02:00 committed by Greg Kroah-Hartman
parent 8be39f6691
commit 0b5e729d4e
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/i2c/i2c-core-base.c
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@ -916,8 +916,9 @@ int i2c_dev_irq_from_resources(const struct resource *resources,
struct i2c_client *
i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
{
struct i2c_client *client;
int status;
struct i2c_client *client;
bool need_put = false;
int status;
client = kzalloc(sizeof *client, GFP_KERNEL);
if (!client)
@ -955,7 +956,6 @@ i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *inf
client->dev.fwnode = info->fwnode;
device_enable_async_suspend(&client->dev);
i2c_dev_set_name(adap, client, info);
if (info->swnode) {
status = device_add_software_node(&client->dev, info->swnode);
@ -967,6 +967,7 @@ 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;
@ -978,6 +979,7 @@ i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *inf
out_remove_swnode:
device_remove_software_node(&client->dev);
need_put = true;
out_err_put_of_node:
of_node_put(info->of_node);
out_err:
@ -985,7 +987,10 @@ i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *inf
"Failed to register i2c client %s at 0x%02x (%d)\n",
client->name, client->addr, status);
out_err_silent:
kfree(client);
if (need_put)
put_device(&client->dev);
else
kfree(client);
return ERR_PTR(status);
}
EXPORT_SYMBOL_GPL(i2c_new_client_device);