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[net-next,v3,01/12] ethtool: fix reference leak in ethnl_set_privflags()

Message ID 1ae600976e0b11c556d35224da395b68700d91e6.1585349448.git.mkubecek@suse.cz
State Accepted
Delegated to: David Miller
Headers show
Series ethtool netlink interface, part 4 | expand

Commit Message

Michal Kubecek March 27, 2020, 11:01 p.m. UTC
Andrew noticed that some handlers for *_SET commands leak a netdev
reference if required ethtool_ops callbacks do not exist. One of them is
ethnl_set_privflags(), a simple reproducer would be e.g.

  ip link add veth1 type veth peer name veth2
  ethtool --set-priv-flags veth1 foo on
  ip link del veth1

Make sure dev_put() is called when ethtool_ops check fails.

Fixes: f265d799596a ("ethtool: set device private flags with PRIVFLAGS_SET request")
Reported-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
 net/ethtool/privflags.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/net/ethtool/privflags.c b/net/ethtool/privflags.c
index e8f03b33db9b..77447dceb109 100644
--- a/net/ethtool/privflags.c
+++ b/net/ethtool/privflags.c
@@ -175,9 +175,10 @@  int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info)
 		return ret;
 	dev = req_info.dev;
 	ops = dev->ethtool_ops;
+	ret = -EOPNOTSUPP;
 	if (!ops->get_priv_flags || !ops->set_priv_flags ||
 	    !ops->get_sset_count || !ops->get_strings)
-		return -EOPNOTSUPP;
+		goto out_dev;
 	ret = ethnl_ops_begin(dev);
@@ -204,6 +205,7 @@  int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info)
 	return ret;