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authorWolfram Sang <wsa+renesas@sang-engineering.com>2023-09-29 12:19:52 +0300
committerWolfram Sang <wsa@kernel.org>2023-10-23 18:25:43 +0300
commit6af79f7fe748fe6a3c5c3a63d7f35981a82c2769 (patch)
tree4491f778f2ff053e155dde93ee4b1123e2335cac /drivers/i2c/i2c-core-base.c
parent8c906cc0aea53aaa7178ca58780e32c14564c139 (diff)
downloadlinux-6af79f7fe748fe6a3c5c3a63d7f35981a82c2769.tar.xz
i2c: fix memleak in i2c_new_client_device()
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>
Diffstat (limited to 'drivers/i2c/i2c-core-base.c')
-rw-r--r--drivers/i2c/i2c-core-base.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 60746652fd52..7f30bcceebae 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -931,8 +931,9 @@ 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)
@@ -970,7 +971,6 @@ 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);
@@ -982,6 +982,7 @@ 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;
@@ -993,6 +994,7 @@ 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:
@@ -1000,7 +1002,10 @@ out_err:
"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);