From c5b6db031643ae9523ab04336a0a0f50c45eab26 Mon Sep 17 00:00:00 2001 From: Michal Kubecek Date: Sun, 22 Mar 2020 22:24:21 +0100 Subject: [PATCH] ethtool: fix reference leak in some *_SET handlers Andrew noticed that some handlers for *_SET commands leak a netdev reference if required ethtool_ops callbacks do not exist. A simple reproducer would be e.g. ip link add veth1 type veth peer name veth2 ethtool -s veth1 wol g ip link del veth1 Make sure dev_put() is called when ethtool_ops check fails. v2: add Fixes tags Fixes: 44458b5c2496 ("ethtool: set link settings with LINKINFO_SET request") Fixes: bf02cbfadf41 ("ethtool: set link modes related data with LINKMODES_SET request") Fixes: fa06d59b376e ("ethtool: set message mask with DEBUG_SET request") Fixes: efc443698486 ("ethtool: set wake-on-lan settings with WOL_SET request") Reported-by: Andrew Lunn Signed-off-by: Michal Kubecek Reviewed-by: Andrew Lunn Reviewed-by: Florian Fainelli Reviewed-by: Jakub Kicinski Signed-off-by: David S. Miller --- net/ethtool/debug.c | 4 +++- net/ethtool/linkinfo.c | 4 +++- net/ethtool/linkmodes.c | 4 +++- net/ethtool/wol.c | 4 +++- 4 files changed, 12 insertions(+), 4 deletions(-) diff --git a/net/ethtool/debug.c b/net/ethtool/debug.c index aaef4843e6baf..92599ad7b3c2d 100644 --- a/net/ethtool/debug.c +++ b/net/ethtool/debug.c @@ -107,8 +107,9 @@ int ethnl_set_debug(struct sk_buff *skb, struct genl_info *info) if (ret < 0) return ret; dev = req_info.dev; + ret = -EOPNOTSUPP; if (!dev->ethtool_ops->get_msglevel || !dev->ethtool_ops->set_msglevel) - return -EOPNOTSUPP; + goto out_dev; rtnl_lock(); ret = ethnl_ops_begin(dev); @@ -129,6 +130,7 @@ out_ops: ethnl_ops_complete(dev); out_rtnl: rtnl_unlock(); +out_dev: dev_put(dev); return ret; } diff --git a/net/ethtool/linkinfo.c b/net/ethtool/linkinfo.c index 5d16cb4e8693d..6e9e0b590bb57 100644 --- a/net/ethtool/linkinfo.c +++ b/net/ethtool/linkinfo.c @@ -126,9 +126,10 @@ int ethnl_set_linkinfo(struct sk_buff *skb, struct genl_info *info) if (ret < 0) return ret; dev = req_info.dev; + ret = -EOPNOTSUPP; if (!dev->ethtool_ops->get_link_ksettings || !dev->ethtool_ops->set_link_ksettings) - return -EOPNOTSUPP; + goto out_dev; rtnl_lock(); ret = ethnl_ops_begin(dev); @@ -162,6 +163,7 @@ out_ops: ethnl_ops_complete(dev); out_rtnl: rtnl_unlock(); +out_dev: dev_put(dev); return ret; } diff --git a/net/ethtool/linkmodes.c b/net/ethtool/linkmodes.c index 96f20be64553e..18cc37be2d9c2 100644 --- a/net/ethtool/linkmodes.c +++ b/net/ethtool/linkmodes.c @@ -338,9 +338,10 @@ int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info) if (ret < 0) return ret; dev = req_info.dev; + ret = -EOPNOTSUPP; if (!dev->ethtool_ops->get_link_ksettings || !dev->ethtool_ops->set_link_ksettings) - return -EOPNOTSUPP; + goto out_dev; rtnl_lock(); ret = ethnl_ops_begin(dev); @@ -370,6 +371,7 @@ out_ops: ethnl_ops_complete(dev); out_rtnl: rtnl_unlock(); +out_dev: dev_put(dev); return ret; } diff --git a/net/ethtool/wol.c b/net/ethtool/wol.c index e1b8a65b64c4b..55e1ecaaf739d 100644 --- a/net/ethtool/wol.c +++ b/net/ethtool/wol.c @@ -128,8 +128,9 @@ int ethnl_set_wol(struct sk_buff *skb, struct genl_info *info) if (ret < 0) return ret; dev = req_info.dev; + ret = -EOPNOTSUPP; if (!dev->ethtool_ops->get_wol || !dev->ethtool_ops->set_wol) - return -EOPNOTSUPP; + goto out_dev; rtnl_lock(); ret = ethnl_ops_begin(dev); @@ -172,6 +173,7 @@ out_ops: ethnl_ops_complete(dev); out_rtnl: rtnl_unlock(); +out_dev: dev_put(dev); return ret; } -- 2.39.5