[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 <redacted>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.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

Hello:

This patch was applied to netdev/net-next.git (refs/heads/master):

On Thu, 5 Aug 2021 21:08:22 +0200 you wrote:

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 <redacted>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

[...]

Here is the summary with links:
  - [net-next] ethtool: return error from ethnl_ops_begin if dev is NULL
    https://git.kernel.org/netdev/net-next/c/596690e9f4fc

You are awesome, thank you!
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