From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 9 Nov 2020 16:14:38 +0000 (+0900)
Subject: ethtool: make ethtool_get_driver() return -ENODATA if ioctl succeeds but driver name... 
X-Git-Tag: v247-rc2~10^2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F17555%2Fhead;p=thirdparty%2Fsystemd.git

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

Inspired by #17532.
---

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;