From e9e13b6adc338be1eb88db87bcb392696144bd02 Mon Sep 17 00:00:00 2001
From: Sergej Bauer <sbauer@blackbox.su>
Date: Mon, 2 Nov 2020 01:35:55 +0300
Subject: [PATCH] lan743x: fix for potential NULL pointer dereference with bare card
Git-commit: e9e13b6adc338be1eb88db87bcb392696144bd02
Patch-mainline: v5.11-rc1
References: git-fixes

This is the 3rd revision of the patch fix for potential null pointer dereference
with lan743x card.

The simpliest way to reproduce: boot with bare lan743x and issue "ethtool ethN"
commant where ethN is the interface with lan743x card. Example:

$ sudo ethtool eth7
Dmesg: 
[  103.510336] BUG: kernel NULL pointer dereference, address: 0000000000000340
...
[  103.510836] RIP: 0010:phy_ethtool_get_wol+0x5/0x30 [libphy]
...
[  103.511629] Call Trace:
[  103.511666]  lan743x_ethtool_get_wol+0x21/0x40 [lan743x]
[  103.511724]  dev_ethtool+0x1507/0x29d0
[  103.511769]  ? avc_has_extended_perms+0x17f/0x440
[  103.511820]  ? tomoyo_init_request_info+0x84/0x90
[  103.511870]  ? tomoyo_path_number_perm+0x68/0x1e0
[  103.511919]  ? tty_insert_flip_string_fixed_flag+0x82/0xe0
[  103.511973]  ? inet_ioctl+0x187/0x1d0
[  103.512016]  dev_ioctl+0xb5/0x560
[  103.512055]  sock_do_ioctl+0xa0/0x140
[  103.512098]  sock_ioctl+0x2cb/0x3c0
[  103.512139]  __x64_sys_ioctl+0x84/0xc0
[  103.512183]  do_syscall_64+0x33/0x80
[  103.512224]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  103.512274] RIP: 0033:0x7f54a9cba427
...

Previous versions can be found at:
V1: 
initial version
    https://lkml.org/lkml/2020/10/28/921

V2: 
do not return from lan743x_ethtool_set_wol if netdev->phydev == NULL, just skip
the call of phy_ethtool_set_wol() instead.
    https://lkml.org/lkml/2020/10/31/380

V3: 
in function lan743x_ethtool_set_wol:
use ternary operator instead of if-else sentence (review by Markus Elfring)
return -ENETDOWN insted of -EIO (review by Andrew Lunn)

Signed-off-by: Sergej Bauer <sbauer@blackbox.su>

Link: https://lore.kernel.org/r/20201101223556.16116-1-sbauer@blackbox.su
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/ethernet/microchip/lan743x_ethtool.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_ethtool.c b/drivers/net/ethernet/microchip/lan743x_ethtool.c
index dcde496da7fb..c5de8f46cdd3 100644
--- a/drivers/net/ethernet/microchip/lan743x_ethtool.c
+++ b/drivers/net/ethernet/microchip/lan743x_ethtool.c
@@ -780,7 +780,9 @@ static void lan743x_ethtool_get_wol(struct net_device *netdev,
 
 	wol->supported = 0;
 	wol->wolopts = 0;
-	phy_ethtool_get_wol(netdev->phydev, wol);
+
+	if (netdev->phydev)
+		phy_ethtool_get_wol(netdev->phydev, wol);
 
 	wol->supported |= WAKE_BCAST | WAKE_UCAST | WAKE_MCAST |
 		WAKE_MAGIC | WAKE_PHY | WAKE_ARP;
@@ -809,9 +811,8 @@ static int lan743x_ethtool_set_wol(struct net_device *netdev,
 
 	device_set_wakeup_enable(&adapter->pdev->dev, (bool)wol->wolopts);
 
-	phy_ethtool_set_wol(netdev->phydev, wol);
-
-	return 0;
+	return netdev->phydev ? phy_ethtool_set_wol(netdev->phydev, wol)
+			: -ENETDOWN;
 }
 #endif /* CONFIG_PM */
 
-- 
2.26.2