diff options
| author | Jouni Hogander <jouni.hogander@unikie.com> | 2019-12-05 15:57:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-26 10:01:09 +0100 |
| commit | 60d671da2fa2e9505e560aef0ee510fc45fb4322 (patch) | |
| tree | 58ce6a1c9a96d3986aebb214b2685d64bdf76165 /net/core | |
| parent | 465b10fee9a8ad820a191b1be0991fdac98b188b (diff) | |
net-sysfs: Call dev_hold always in netdev_queue_add_kobject
[ Upstream commit e0b60903b434a7ee21ba8d8659f207ed84101e89 ]
Dev_hold has to be called always in netdev_queue_add_kobject.
Otherwise usage count drops below 0 in case of failure in
kobject_init_and_add.
Fixes: b8eb718348b8 ("net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject")
Reported-by: Hulk Robot <hulkci@huawei.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: David Miller <davem@davemloft.net>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/net-sysfs.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index b4db68e5caa9..4c826b8bf9b1 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -1462,14 +1462,17 @@ static int netdev_queue_add_kobject(struct net_device *dev, int index) struct kobject *kobj = &queue->kobj; int error = 0; + /* Kobject_put later will trigger netdev_queue_release call + * which decreases dev refcount: Take that reference here + */ + dev_hold(queue->dev); + kobj->kset = dev->queues_kset; error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, "tx-%u", index); if (error) goto err; - dev_hold(queue->dev); - #ifdef CONFIG_BQL error = sysfs_create_group(kobj, &dql_group); if (error) |