netdev - [PATCH] net: ethernet: Fix phy_set_max

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190304233622.13981-1-pakki001@umn.edu>
Date:   Mon,  4 Mar 2019 17:36:22 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Doug Berger <opendmb@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: ethernet: Fix phy_set_max_speed by checking for NULL

phy_device can be a NULL pointer which is further dereferenced
downstream in phy_set_max_speed. This patch avoids such a scenario.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/net/ethernet/broadcom/genet/bcmmii.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index aceb9b7b55bd..7eaaecb53aa2 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -213,6 +213,8 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 		break;
 
 	case PHY_INTERFACE_MODE_MII:
+		if (!phydev)
+			return -ENODEV;
 		phy_name = "external MII";
 		phy_set_max_speed(phydev, SPEED_100);
 		bcmgenet_sys_writel(priv,
-- 
2.17.1