This is a note to let you know that I've just added the patch titled net/ethtool/ioctl: return -EOPNOTSUPP if we have no phy stats to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-ethtool-ioctl-return-eopnotsupp-if-we-have-no-ph.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit a72bd6f5db91289711a8cca9363e3bb2258be8fb Author: Daniil Tatianin <d-tatianin@xxxxxxxxxxxxxx> Date: Mon Dec 26 14:48:23 2022 +0300 net/ethtool/ioctl: return -EOPNOTSUPP if we have no phy stats [ Upstream commit 9deb1e9fb88b1120a908676fa33bdf9e2eeaefce ] It's not very useful to copy back an empty ethtool_stats struct and return 0 if we didn't actually have any stats. This also allows for further simplification of this function in the future commits. Signed-off-by: Daniil Tatianin <d-tatianin@xxxxxxxxxxxxxx> Reviewed-by: Andrew Lunn <andrew@xxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/core/ethtool.c b/net/core/ethtool.c index 749d48393d06..fe2217e339dc 100644 --- a/net/core/ethtool.c +++ b/net/core/ethtool.c @@ -1969,7 +1969,8 @@ static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr) return n_stats; if (n_stats > S32_MAX / sizeof(u64)) return -ENOMEM; - WARN_ON_ONCE(!n_stats); + if (WARN_ON_ONCE(!n_stats)) + return -EOPNOTSUPP; if (copy_from_user(&stats, useraddr, sizeof(stats))) return -EFAULT;