ethtool: make ethtool_get_driver() return -ENODATA if ioctl succeeds but driver name...

Inspired by #17532.

(cherry picked from commit 861de64e6858bc92b154ad70d1cee41ae5b75835)

diff --git a/src/shared/ethtool-util.c b/src/shared/ethtool-util.c
index 14e91e3e4d00e0e8ea9a803e856b80cd1e7c16f1..abf76f5f249fb55d7cfdaf553aff0665a2a0ee96 100644 (file)
--- a/src/shared/ethtool-util.c
+++ b/src/shared/ethtool-util.c
@@ -170,6 +170,9 @@ 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;