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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Brandon Maier <brandon.maier@rockwellcollins.com>,
        "David S . Miller" <davem@davemloft.net>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL 4.18 088/136] net: phy: xgmiitorgmii: Check phy_driver
 ready before accessing
Thread-Topic: [PATCH AUTOSEL 4.18 088/136] net: phy: xgmiitorgmii: Check
 phy_driver ready before accessing
Thread-Index: AQHUTjKu1zPnUgEgjkGwfngTvheUGQ==
Date:   Mon, 17 Sep 2018 03:01:07 +0000
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From: Brandon Maier <brandon.maier@rockwellcollins.com>

[ Upstream commit ab4e6ee578e88a659938db8fbf33720bc048d29c ]

Since a phy_device is added to the global mdio_bus list during
phy_device_register(), but a phy_device's phy_driver doesn't get
attached until phy_probe(). It's possible of_phy_find_device() in
xgmiitorgmii will return a valid phy with a NULL phy_driver. Leading to
a NULL pointer access during the memcpy().

Fixes this Oops:

Unable to handle kernel NULL pointer dereference at virtual address 0000000=
0
pgd =3D c0004000
[00000000] *pgd=3D00000000
Internal error: Oops: 5 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.40 #1
Hardware name: Xilinx Zynq Platform
task: ce4c8d00 task.stack: ce4ca000
PC is at memcpy+0x48/0x330
LR is at xgmiitorgmii_probe+0x90/0xe8
pc : [<c074bc68>]    lr : [<c0529548>]    psr: 20000013
sp : ce4cbb54  ip : 00000000  fp : ce4cbb8c
r10: 00000000  r9 : 00000000  r8 : c0c49178
r7 : 00000000  r6 : cdc14718  r5 : ce762800  r4 : cdc14710
r3 : 00000000  r2 : 00000054  r1 : 00000000  r0 : cdc14718
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 18c5387d  Table: 0000404a  DAC: 00000051
Process swapper/0 (pid: 1, stack limit =3D 0xce4ca210)
...
[<c074bc68>] (memcpy) from [<c0529548>] (xgmiitorgmii_probe+0x90/0xe8)
[<c0529548>] (xgmiitorgmii_probe) from [<c0526a94>] (mdio_probe+0x28/0x34)
[<c0526a94>] (mdio_probe) from [<c04db98c>] (driver_probe_device+0x254/0x41=
4)
[<c04db98c>] (driver_probe_device) from [<c04dbd58>] (__device_attach_drive=
r+0xac/0x10c)
[<c04dbd58>] (__device_attach_driver) from [<c04d96f4>] (bus_for_each_drv+0=
x84/0xc8)
[<c04d96f4>] (bus_for_each_drv) from [<c04db5bc>] (__device_attach+0xd0/0x1=
34)
[<c04db5bc>] (__device_attach) from [<c04dbdd4>] (device_initial_probe+0x1c=
/0x20)
[<c04dbdd4>] (device_initial_probe) from [<c04da8fc>] (bus_probe_device+0x9=
8/0xa0)
[<c04da8fc>] (bus_probe_device) from [<c04d8660>] (device_add+0x43c/0x5d0)
[<c04d8660>] (device_add) from [<c0526cb8>] (mdio_device_register+0x34/0x80=
)
[<c0526cb8>] (mdio_device_register) from [<c0580b48>] (of_mdiobus_register+=
0x170/0x30c)
[<c0580b48>] (of_mdiobus_register) from [<c05349c4>] (macb_probe+0x710/0xc0=
0)
[<c05349c4>] (macb_probe) from [<c04dd700>] (platform_drv_probe+0x44/0x80)
[<c04dd700>] (platform_drv_probe) from [<c04db98c>] (driver_probe_device+0x=
254/0x414)
[<c04db98c>] (driver_probe_device) from [<c04dbc58>] (__driver_attach+0x10c=
/0x118)
[<c04dbc58>] (__driver_attach) from [<c04d9600>] (bus_for_each_dev+0x8c/0xd=
0)
[<c04d9600>] (bus_for_each_dev) from [<c04db1fc>] (driver_attach+0x2c/0x30)
[<c04db1fc>] (driver_attach) from [<c04daa98>] (bus_add_driver+0x50/0x260)
[<c04daa98>] (bus_add_driver) from [<c04dc440>] (driver_register+0x88/0x108=
)
[<c04dc440>] (driver_register) from [<c04dd6b4>] (__platform_driver_registe=
r+0x50/0x58)
[<c04dd6b4>] (__platform_driver_register) from [<c0b31248>] (macb_driver_in=
it+0x24/0x28)
[<c0b31248>] (macb_driver_init) from [<c010203c>] (do_one_initcall+0x60/0x1=
a4)
[<c010203c>] (do_one_initcall) from [<c0b00f78>] (kernel_init_freeable+0x15=
c/0x1f8)
[<c0b00f78>] (kernel_init_freeable) from [<c0763d10>] (kernel_init+0x18/0x1=
24)
[<c0763d10>] (kernel_init) from [<c0112d74>] (ret_from_fork+0x14/0x20)
Code: ba000002 f5d1f03c f5d1f05c f5d1f07c (e8b151f8)
---[ end trace 3e4ec21905820a1f ]---

Signed-off-by: Brandon Maier <brandon.maier@rockwellcollins.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/net/phy/xilinx_gmii2rgmii.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/phy/xilinx_gmii2rgmii.c b/drivers/net/phy/xilinx_g=
mii2rgmii.c
index 449b31319010..7a14e8170e82 100644
--- a/drivers/net/phy/xilinx_gmii2rgmii.c
+++ b/drivers/net/phy/xilinx_gmii2rgmii.c
@@ -84,6 +84,11 @@ static int xgmiitorgmii_probe(struct mdio_device *mdiode=
v)
 		return -EPROBE_DEFER;
 	}
=20
+	if (!priv->phy_dev->drv) {
+		dev_info(dev, "Attached phy not ready\n");
+		return -EPROBE_DEFER;
+	}
+
 	priv->addr =3D mdiodev->addr;
 	priv->phy_drv =3D priv->phy_dev->drv;
 	memcpy(&priv->conv_phy_drv, priv->phy_dev->drv,
--=20
2.17.1