From: Michal Kubecek <mkubecek@suse.cz>
To: David Miller <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org
Cc: Jiri Pirko <jiri@resnulli.us>, Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
John Linville <linville@tuxdriver.com>,
Johannes Berg <johannes@sipsolutions.net>,
Richard Cochran <richardcochran@gmail.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH net-next v2 01/12] ethtool: fix reference leak in ethnl_set_privflags()
Date: Fri, 27 Mar 2020 15:07:22 +0100 (CET) [thread overview]
Message-ID: <c81ba0369c2182ba2e48d13adf2a2589567a6896.1585316159.git.mkubecek@suse.cz> (raw)
In-Reply-To: <cover.1585316159.git.mkubecek@suse.cz>
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(-)
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;
rtnl_lock();
ret = ethnl_ops_begin(dev);
@@ -204,6 +205,7 @@ int ethnl_set_privflags(struct sk_buff *skb, struct genl_info *info)
ethnl_ops_complete(dev);
out_rtnl:
rtnl_unlock();
+out_dev:
dev_put(dev);
return ret;
}
--
2.25.1
next prev parent reply other threads:[~2020-03-27 14:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-27 14:07 [PATCH net-next v2 00/12] ethtool netlink interface, part 4 Michal Kubecek
2020-03-27 14:07 ` Michal Kubecek [this message]
2020-03-27 14:07 ` [PATCH net-next v2 02/12] ethtool: provide coalescing parameters with COALESCE_GET request Michal Kubecek
2020-03-27 14:07 ` [PATCH net-next v2 03/12] ethtool: set coalescing parameters with COALESCE_SET request Michal Kubecek
2020-03-27 14:07 ` [PATCH net-next v2 04/12] ethtool: add COALESCE_NTF notification Michal Kubecek
2020-03-27 14:07 ` [PATCH net-next v2 05/12] ethtool: provide pause parameters with PAUSE_GET request Michal Kubecek
2020-03-27 14:07 ` [PATCH net-next v2 06/12] ethtool: set pause parameters with PAUSE_SET request Michal Kubecek
2020-03-27 14:07 ` [PATCH net-next v2 07/12] ethtool: add PAUSE_NTF notification Michal Kubecek
2020-03-27 14:07 ` [PATCH net-next v2 08/12] ethtool: provide EEE settings with EEE_GET request Michal Kubecek
2020-03-27 14:08 ` [PATCH net-next v2 09/12] ethtool: set EEE settings with EEE_SET request Michal Kubecek
2020-03-27 14:08 ` [PATCH net-next v2 10/12] ethtool: add EEE_NTF notification Michal Kubecek
2020-03-27 14:08 ` [PATCH net-next v2 11/12] ethtool: add timestamping related string sets Michal Kubecek
2020-03-27 18:53 ` Richard Cochran
2020-03-27 19:43 ` Michal Kubecek
2020-03-27 14:08 ` [PATCH net-next v2 12/12] ethtool: provide timestamping information with TIMESTAMP_GET request Michal Kubecek
2020-03-27 18:56 ` Richard Cochran
2020-03-27 19:45 ` Michal Kubecek
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