netdev - [PATCH net-next] ethtool: return error from ethnl_ops

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]

Date:   Thu, 5 Aug 2021 21:08:22 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Julian Wiedmann <jwi@...ux.ibm.com>
Subject: [PATCH net-next] ethtool: return error from ethnl_ops_begin if dev is
 NULL

Julian reported that after d43c65b05b84 Coverity complains about a
missing check whether dev is NULL in ethnl_ops_complete().
There doesn't seem to be any valid case where dev could be NULL when
calling ethnl_ops_begin(), therefore return an error if dev is NULL.

Fixes: d43c65b05b84 ("ethtool: runtime-resume netdev parent in ethnl_ops_begin")
Reported-by: Julian Wiedmann <jwi@...ux.ibm.com>
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 net/ethtool/netlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ethtool/netlink.c b/net/ethtool/netlink.c
index 417aaf9ca..fe8bf2b3c 100644
--- a/net/ethtool/netlink.c
+++ b/net/ethtool/netlink.c
@@ -35,7 +35,7 @@ int ethnl_ops_begin(struct net_device *dev)
 	int ret;
 
 	if (!dev)
-		return 0;
+		return -ENODEV;
 
 	if (dev->dev.parent)
 		pm_runtime_get_sync(dev->dev.parent);
@@ -61,7 +61,7 @@ int ethnl_ops_begin(struct net_device *dev)
 
 void ethnl_ops_complete(struct net_device *dev)
 {
-	if (dev && dev->ethtool_ops->complete)
+	if (dev->ethtool_ops->complete)
 		dev->ethtool_ops->complete(dev);
 
 	if (dev->dev.parent)
-- 
2.32.0