netdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* [PATCH] net: mdiobus: Fix memory leak in __mdiobus_register
@ 2021-09-26  4:53 Yanfei Xu
  2021-09-26 15:34 ` Andrew Lunn
                   ` (4 more replies)
  0 siblings, 5 replies; 23+ messages in thread
From: Yanfei Xu @ 2021-09-26  4:53 UTC (permalink / raw)
  To: andrew, hkallweit1, linux, davem, kuba, p.zabel,
	syzbot+398e7dc692ddbbb4cfec
  Cc: linux-kernel, netdev

Once device_register() failed, we should call put_device() to
decrement reference count for cleanup. Or it will cause memory
leak.

BUG: memory leak
unreferenced object 0xffff888114032e00 (size 256):
  comm "kworker/1:3", pid 2960, jiffies 4294943572 (age 15.920s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 08 2e 03 14 81 88 ff ff  ................
    08 2e 03 14 81 88 ff ff 90 76 65 82 ff ff ff ff  .........ve.....
  backtrace:
    [<ffffffff8265cfab>] kmalloc include/linux/slab.h:591 [inline]
    [<ffffffff8265cfab>] kzalloc include/linux/slab.h:721 [inline]
    [<ffffffff8265cfab>] device_private_init drivers/base/core.c:3203 [inline]
    [<ffffffff8265cfab>] device_add+0x89b/0xdf0 drivers/base/core.c:3253
    [<ffffffff828dd643>] __mdiobus_register+0xc3/0x450 drivers/net/phy/mdio_bus.c:537
    [<ffffffff828cb835>] __devm_mdiobus_register+0x75/0xf0 drivers/net/phy/mdio_devres.c:87
    [<ffffffff82b92a00>] ax88772_init_mdio drivers/net/usb/asix_devices.c:676 [inline]
    [<ffffffff82b92a00>] ax88772_bind+0x330/0x480 drivers/net/usb/asix_devices.c:786
    [<ffffffff82baa33f>] usbnet_probe+0x3ff/0xdf0 drivers/net/usb/usbnet.c:1745
    [<ffffffff82c36e17>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<ffffffff82661d17>] call_driver_probe drivers/base/dd.c:517 [inline]
    [<ffffffff82661d17>] really_probe.part.0+0xe7/0x380 drivers/base/dd.c:596
    [<ffffffff826620bc>] really_probe drivers/base/dd.c:558 [inline]
    [<ffffffff826620bc>] __driver_probe_device+0x10c/0x1e0 drivers/base/dd.c:751
    [<ffffffff826621ba>] driver_probe_device+0x2a/0x120 drivers/base/dd.c:781
    [<ffffffff82662a26>] __device_attach_driver+0xf6/0x140 drivers/base/dd.c:898
    [<ffffffff8265eca7>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:427
    [<ffffffff826625a2>] __device_attach+0x122/0x260 drivers/base/dd.c:969
    [<ffffffff82660916>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:487
    [<ffffffff8265cd0b>] device_add+0x5fb/0xdf0 drivers/base/core.c:3359
    [<ffffffff82c343b9>] usb_set_configuration+0x9d9/0xb90 drivers/usb/core/message.c:2170
    [<ffffffff82c4473c>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238

BUG: memory leak
unreferenced object 0xffff888116f06900 (size 32):
  comm "kworker/0:2", pid 2670, jiffies 4294944448 (age 7.160s)
  hex dump (first 32 bytes):
    75 73 62 2d 30 30 31 3a 30 30 33 00 00 00 00 00  usb-001:003.....
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81484516>] kstrdup+0x36/0x70 mm/util.c:60
    [<ffffffff814845a3>] kstrdup_const+0x53/0x80 mm/util.c:83
    [<ffffffff82296ba2>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<ffffffff82358d4b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289
    [<ffffffff826575f3>] dev_set_name+0x63/0x90 drivers/base/core.c:3147
    [<ffffffff828dd63b>] __mdiobus_register+0xbb/0x450 drivers/net/phy/mdio_bus.c:535
    [<ffffffff828cb835>] __devm_mdiobus_register+0x75/0xf0 drivers/net/phy/mdio_devres.c:87
    [<ffffffff82b92a00>] ax88772_init_mdio drivers/net/usb/asix_devices.c:676 [inline]
    [<ffffffff82b92a00>] ax88772_bind+0x330/0x480 drivers/net/usb/asix_devices.c:786
    [<ffffffff82baa33f>] usbnet_probe+0x3ff/0xdf0 drivers/net/usb/usbnet.c:1745
    [<ffffffff82c36e17>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
    [<ffffffff82661d17>] call_driver_probe drivers/base/dd.c:517 [inline]
    [<ffffffff82661d17>] really_probe.part.0+0xe7/0x380 drivers/base/dd.c:596
    [<ffffffff826620bc>] really_probe drivers/base/dd.c:558 [inline]
    [<ffffffff826620bc>] __driver_probe_device+0x10c/0x1e0 drivers/base/dd.c:751
    [<ffffffff826621ba>] driver_probe_device+0x2a/0x120 drivers/base/dd.c:781
    [<ffffffff82662a26>] __device_attach_driver+0xf6/0x140 drivers/base/dd.c:898
    [<ffffffff8265eca7>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:427
    [<ffffffff826625a2>] __device_attach+0x122/0x260 drivers/base/dd.c:969

Reported-by: syzbot+398e7dc692ddbbb4cfec@syzkaller.appspotmail.com
Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com>
---
 drivers/net/phy/mdio_bus.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 53f034fc2ef7..6f4b4e5df639 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -537,6 +537,7 @@ int __mdiobus_register(struct mii_bus *bus, struct module *owner)
 	err = device_register(&bus->dev);
 	if (err) {
 		pr_err("mii_bus %s failed to register\n", bus->id);
+		put_device(&bus->dev);
 		return -EINVAL;
 	}
 
-- 
2.27.0


^ permalink raw reply	[flat|nested] 23+ messages in thread

end of thread, other threads:[~2021-09-29 21:34 UTC | newest]

Thread overview: 23+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-26  4:53 [PATCH] net: mdiobus: Fix memory leak in __mdiobus_register Yanfei Xu
2021-09-26 15:34 ` Andrew Lunn
2021-09-27 12:30 ` patchwork-bot+netdevbpf
2021-09-28  8:55 ` Dan Carpenter
2021-09-28  9:26   ` Dan Carpenter
2021-09-28  9:45     ` Pavel Skripkin
2021-09-28 10:39       ` Dan Carpenter
2021-09-28 10:46         ` Pavel Skripkin
2021-09-28 10:55           ` Dan Carpenter
2021-09-28 11:04             ` Pavel Skripkin
2021-09-28 10:59           ` Dan Carpenter
2021-09-28 11:06             ` Pavel Skripkin
2021-09-28 11:09               ` Pavel Skripkin
2021-09-28 11:30                 ` Dan Carpenter
2021-09-28 11:45                   ` Pavel Skripkin
2021-09-28 12:23                     ` Dan Carpenter
2021-09-28 12:58                   ` Russell King (Oracle)
2021-09-28 13:52                     ` Dan Carpenter
2021-09-28 15:41                       ` Russell King (Oracle)
2021-09-28 15:48                         ` Dongliang Mu
2021-09-29  2:05                           ` Xu, Yanfei
2021-09-28 13:11 ` Russell King (Oracle)
2021-09-29 21:31 ` Denis Efremov

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).