From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Wen Yang <wen.yang99@zte.com.cn>,
"David S. Miller" <davem@davemloft.net>,
Thomas Gleixner <tglx@linutronix.de>,
Luis Chamberlain <mcgrof@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
netdev@vger.kernel.org, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 110/183] net: pasemi: fix an use-after-free in pasemi_mac_phy_init()
Date: Tue, 28 Jan 2020 15:05:29 +0100 [thread overview]
Message-ID: <20200128135840.905748645@linuxfoundation.org> (raw)
In-Reply-To: <20200128135829.486060649@linuxfoundation.org>
From: Wen Yang <wen.yang99@zte.com.cn>
[ Upstream commit faf5577f2498cea23011b5c785ef853ded22700b ]
The phy_dn variable is still being used in of_phy_connect() after the
of_node_put() call, which may result in use-after-free.
Fixes: 1dd2d06c0459 ("net: Rework pasemi_mac driver to use of_mdio infrastructure")
Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/pasemi/pasemi_mac.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/pasemi/pasemi_mac.c b/drivers/net/ethernet/pasemi/pasemi_mac.c
index 57a6e6cd74fc3..48106953cf64b 100644
--- a/drivers/net/ethernet/pasemi/pasemi_mac.c
+++ b/drivers/net/ethernet/pasemi/pasemi_mac.c
@@ -1091,7 +1091,6 @@ static int pasemi_mac_phy_init(struct net_device *dev)
dn = pci_device_to_OF_node(mac->pdev);
phy_dn = of_parse_phandle(dn, "phy-handle", 0);
- of_node_put(phy_dn);
mac->link = 0;
mac->speed = 0;
@@ -1100,6 +1099,7 @@ static int pasemi_mac_phy_init(struct net_device *dev)
phydev = of_phy_connect(dev, phy_dn, &pasemi_adjust_link, 0,
PHY_INTERFACE_MODE_SGMII);
+ of_node_put(phy_dn);
if (!phydev) {
printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
return -ENODEV;
--
2.20.1
next parent reply other threads:[~2020-01-28 14:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200128135829.486060649@linuxfoundation.org>
2020-01-28 14:05 ` Greg Kroah-Hartman [this message]
2020-01-28 14:06 ` [PATCH 4.4 160/183] can, slip: Protect tty->disc_data in write_wakeup and close with RCU Greg Kroah-Hartman
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