mirror of
https://github.com/torvalds/linux.git
synced 2024-12-13 22:53:20 +00:00
75d9b8559a
Fault injection test reported memory leak of hci device as follows:
unreferenced object 0xffff88800b858000 (size 8192):
comm "kworker/0:2", pid 167, jiffies 4294955747 (age 557.148s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 ad 4e ad de .............N..
backtrace:
[<0000000070eb1059>] kmem_cache_alloc_trace mm/slub.c:3208
[<00000000015eb521>] hci_alloc_dev_priv include/linux/slab.h:591
[<00000000dcfc1e21>] bpa10x_probe include/net/bluetooth/hci_core.h:1240
[<000000005d3028c7>] usb_probe_interface drivers/usb/core/driver.c:397
[<00000000cbac9243>] really_probe drivers/base/dd.c:517
[<0000000024cab3f0>] __driver_probe_device drivers/base/dd.c:751
[<00000000202135cb>] driver_probe_device drivers/base/dd.c:782
[<000000000761f2bc>] __device_attach_driver drivers/base/dd.c:899
[<00000000f7d63134>] bus_for_each_drv drivers/base/bus.c:427
[<00000000c9551f0b>] __device_attach drivers/base/dd.c:971
[<000000007f79bd16>] bus_probe_device drivers/base/bus.c:487
[<000000007bb8b95a>] device_add drivers/base/core.c:3364
[<000000009564d9ea>] usb_set_configuration drivers/usb/core/message.c:2171
[<00000000e4657087>] usb_generic_driver_probe drivers/usb/core/generic.c:239
[<0000000071ede518>] usb_probe_device drivers/usb/core/driver.c:294
[<00000000cbac9243>] really_probe drivers/base/dd.c:517
hci_alloc_dev() do not init the device's flag. And hci_free_dev()
using put_device() to free the memory allocated for this device,
but it calls just put_device(dev) only in case of HCI_UNREGISTER
flag is set, So any error handing before hci_register_dev() success
will cause memory leak.
To avoid this behaviour we can using kfree() to release dev before
hci_register_dev() success.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
121 lines
2.3 KiB
C
121 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Bluetooth HCI driver model support. */
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <net/bluetooth/bluetooth.h>
|
|
#include <net/bluetooth/hci_core.h>
|
|
|
|
static struct class *bt_class;
|
|
|
|
static void bt_link_release(struct device *dev)
|
|
{
|
|
struct hci_conn *conn = to_hci_conn(dev);
|
|
kfree(conn);
|
|
}
|
|
|
|
static const struct device_type bt_link = {
|
|
.name = "link",
|
|
.release = bt_link_release,
|
|
};
|
|
|
|
/*
|
|
* The rfcomm tty device will possibly retain even when conn
|
|
* is down, and sysfs doesn't support move zombie device,
|
|
* so we should move the device before conn device is destroyed.
|
|
*/
|
|
static int __match_tty(struct device *dev, void *data)
|
|
{
|
|
return !strncmp(dev_name(dev), "rfcomm", 6);
|
|
}
|
|
|
|
void hci_conn_init_sysfs(struct hci_conn *conn)
|
|
{
|
|
struct hci_dev *hdev = conn->hdev;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
conn->dev.type = &bt_link;
|
|
conn->dev.class = bt_class;
|
|
conn->dev.parent = &hdev->dev;
|
|
|
|
device_initialize(&conn->dev);
|
|
}
|
|
|
|
void hci_conn_add_sysfs(struct hci_conn *conn)
|
|
{
|
|
struct hci_dev *hdev = conn->hdev;
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
|
|
|
|
if (device_add(&conn->dev) < 0) {
|
|
bt_dev_err(hdev, "failed to register connection device");
|
|
return;
|
|
}
|
|
|
|
hci_dev_hold(hdev);
|
|
}
|
|
|
|
void hci_conn_del_sysfs(struct hci_conn *conn)
|
|
{
|
|
struct hci_dev *hdev = conn->hdev;
|
|
|
|
if (!device_is_registered(&conn->dev))
|
|
return;
|
|
|
|
while (1) {
|
|
struct device *dev;
|
|
|
|
dev = device_find_child(&conn->dev, NULL, __match_tty);
|
|
if (!dev)
|
|
break;
|
|
device_move(dev, NULL, DPM_ORDER_DEV_LAST);
|
|
put_device(dev);
|
|
}
|
|
|
|
device_del(&conn->dev);
|
|
|
|
hci_dev_put(hdev);
|
|
}
|
|
|
|
static void bt_host_release(struct device *dev)
|
|
{
|
|
struct hci_dev *hdev = to_hci_dev(dev);
|
|
|
|
if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
|
|
hci_release_dev(hdev);
|
|
else
|
|
kfree(hdev);
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
static const struct device_type bt_host = {
|
|
.name = "host",
|
|
.release = bt_host_release,
|
|
};
|
|
|
|
void hci_init_sysfs(struct hci_dev *hdev)
|
|
{
|
|
struct device *dev = &hdev->dev;
|
|
|
|
dev->type = &bt_host;
|
|
dev->class = bt_class;
|
|
|
|
__module_get(THIS_MODULE);
|
|
device_initialize(dev);
|
|
}
|
|
|
|
int __init bt_sysfs_init(void)
|
|
{
|
|
bt_class = class_create(THIS_MODULE, "bluetooth");
|
|
|
|
return PTR_ERR_OR_ZERO(bt_class);
|
|
}
|
|
|
|
void bt_sysfs_cleanup(void)
|
|
{
|
|
class_destroy(bt_class);
|
|
}
|