From 861de64e6858bc92b154ad70d1cee41ae5b75835 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 10 Nov 2020 01:14:38 +0900
Subject: [PATCH] ethtool: make ethtool_get_driver() return -ENODATA if ioctl
 succeeds but driver name is empty

Inspired by #17532.
---
 src/shared/ethtool-util.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/shared/ethtool-util.c b/src/shared/ethtool-util.c
index bf5d5c6a0c5..e6fab262f2d 100644
--- a/src/shared/ethtool-util.c
+++ b/src/shared/ethtool-util.c
@@ -197,6 +197,9 @@ int ethtool_get_driver(int *ethtool_fd, const char *ifname, char **ret) {
         if (r < 0)
                 return -errno;
 
+        if (isempty(ecmd.driver))
+                return -ENODATA;
+
         d = strdup(ecmd.driver);
         if (!d)
                 return -ENOMEM;
-- 
2.47.3