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Date: Sun, 25 Jan 2015 10:07:53 -0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Alexander Fomichev <git.user@...il.com>, "David S. Miller" <davem@...emloft.net>, Miquel van Smoorenburg <mikevs@...all.net> Subject: [PATCH 3.14 95/98] net: fix creation adjacent device symlinks 3.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Alexander Y. Fomichev" <git.user@...il.com> commit 7ce64c79c4decdeb1afe0bf2f6ef834b382871d1 upstream. __netdev_adjacent_dev_insert may add adjust device of different net namespace, without proper check it leads to emergence of broken sysfs links from/to devices in another namespace. Fix: rewrite netdev_adjacent_is_neigh_list macro as a function, move net_eq check into netdev_adjacent_is_neigh_list. (thanks David) related to: 4c75431ac3520631f1d9e74aa88407e6374dbbc4 Signed-off-by: Alexander Fomichev <git.user@...il.com> Signed-off-by: David S. Miller <davem@...emloft.net> Cc: Miquel van Smoorenburg <mikevs@...all.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/core/dev.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4705,9 +4705,14 @@ static void netdev_adjacent_sysfs_del(st sysfs_remove_link(&(dev->dev.kobj), linkname); } -#define netdev_adjacent_is_neigh_list(dev, dev_list) \ - (dev_list == &dev->adj_list.upper || \ - dev_list == &dev->adj_list.lower) +static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, + struct net_device *adj_dev, + struct list_head *dev_list) +{ + return (dev_list == &dev->adj_list.upper || + dev_list == &dev->adj_list.lower) && + net_eq(dev_net(dev), dev_net(adj_dev)); +} static int __netdev_adjacent_dev_insert(struct net_device *dev, struct net_device *adj_dev, @@ -4737,7 +4742,7 @@ static int __netdev_adjacent_dev_insert( pr_debug("dev_hold for %s, because of link added from %s to %s\n", adj_dev->name, dev->name, adj_dev->name); - if (netdev_adjacent_is_neigh_list(dev, dev_list)) { + if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); if (ret) goto free_adj; @@ -4758,7 +4763,7 @@ static int __netdev_adjacent_dev_insert( return 0; remove_symlinks: - if (netdev_adjacent_is_neigh_list(dev, dev_list)) + if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); free_adj: kfree(adj); @@ -4791,8 +4796,7 @@ static void __netdev_adjacent_dev_remove if (adj->master) sysfs_remove_link(&(dev->dev.kobj), "master"); - if (netdev_adjacent_is_neigh_list(dev, dev_list) && - net_eq(dev_net(dev),dev_net(adj_dev))) + if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); list_del_rcu(&adj->list); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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