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author | Li Zetao <lizetao1@huawei.com> | 2022-12-13 15:56:14 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-14 12:16:10 +0300 |
commit | 3d5f83a62e8235d235534b3dc6f197d8a822c269 (patch) | |
tree | bd577da3b6eb03f83f02c2fac40a30d12e52e72a /drivers/net | |
parent | aea9e64dec2cc6cd742e07ecd4e6236fc76b389b (diff) | |
download | linux-3d5f83a62e8235d235534b3dc6f197d8a822c269.tar.xz |
r6040: Fix kmemleak in probe and remove
[ Upstream commit 7e43039a49c2da45edc1d9d7c9ede4003ab45a5f ]
There is a memory leaks reported by kmemleak:
unreferenced object 0xffff888116111000 (size 2048):
comm "modprobe", pid 817, jiffies 4294759745 (age 76.502s)
hex dump (first 32 bytes):
00 c4 0a 04 81 88 ff ff 08 10 11 16 81 88 ff ff ................
08 10 11 16 81 88 ff ff 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff815bcd82>] kmalloc_trace+0x22/0x60
[<ffffffff827e20ee>] phy_device_create+0x4e/0x90
[<ffffffff827e6072>] get_phy_device+0xd2/0x220
[<ffffffff827e7844>] mdiobus_scan+0xa4/0x2e0
[<ffffffff827e8be2>] __mdiobus_register+0x482/0x8b0
[<ffffffffa01f5d24>] r6040_init_one+0x714/0xd2c [r6040]
...
The problem occurs in probe process as follows:
r6040_init_one:
mdiobus_register
mdiobus_scan <- alloc and register phy_device,
the reference count of phy_device is 3
r6040_mii_probe
phy_connect <- connect to the first phy_device,
so the reference count of the first
phy_device is 4, others are 3
register_netdev <- fault inject succeeded, goto error handling path
// error handling path
err_out_mdio_unregister:
mdiobus_unregister(lp->mii_bus);
err_out_mdio:
mdiobus_free(lp->mii_bus); <- the reference count of the first
phy_device is 1, it is not released
and other phy_devices are released
// similarly, the remove process also has the same problem
The root cause is traced to the phy_device is not disconnected when
removes one r6040 device in r6040_remove_one() or on error handling path
after r6040_mii probed successfully. In r6040_mii_probe(), a net ethernet
device is connected to the first PHY device of mii_bus, in order to
notify the connected driver when the link status changes, which is the
default behavior of the PHY infrastructure to handle everything.
Therefore the phy_device should be disconnected when removes one r6040
device or on error handling path.
Fix it by adding phy_disconnect() when removes one r6040 device or on
error handling path after r6040_mii probed successfully.
Fixes: 3831861b4ad8 ("r6040: implement phylib")
Signed-off-by: Li Zetao <lizetao1@huawei.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20221213125614.927754-1-lizetao1@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/net')
-rw-r--r-- | drivers/net/ethernet/rdc/r6040.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/net/ethernet/rdc/r6040.c b/drivers/net/ethernet/rdc/r6040.c index ccdfa930130b..4cff544f04c2 100644 --- a/drivers/net/ethernet/rdc/r6040.c +++ b/drivers/net/ethernet/rdc/r6040.c @@ -1158,10 +1158,12 @@ static int r6040_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) err = register_netdev(dev); if (err) { dev_err(&pdev->dev, "Failed to register net device\n"); - goto err_out_mdio_unregister; + goto err_out_phy_disconnect; } return 0; +err_out_phy_disconnect: + phy_disconnect(dev->phydev); err_out_mdio_unregister: mdiobus_unregister(lp->mii_bus); err_out_mdio: @@ -1185,6 +1187,7 @@ static void r6040_remove_one(struct pci_dev *pdev) struct r6040_private *lp = netdev_priv(dev); unregister_netdev(dev); + phy_disconnect(dev->phydev); mdiobus_unregister(lp->mii_bus); mdiobus_free(lp->mii_bus); netif_napi_del(&lp->napi); |