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| author | Jouni Hogander <jouni.hogander@unikie.com> | 2019-12-17 14:46:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-29 18:43:17 +0300 |
| commit | 33c540f663d1dc95461380e2e2ca83cc9b25dd59 (patch) | |
| tree | 3d60b6e603cf40a801fc62ba4891fa1b6d5132fe /net/core | |
| parent | f8862bc44fadf9d96c7819bf12b9025240f065c9 (diff) | |
| download | linux-33c540f663d1dc95461380e2e2ca83cc9b25dd59.tar.xz | |
net-sysfs: Call dev_hold always in rx_queue_add_kobject
commit ddd9b5e3e765d8ed5a35786a6cb00111713fe161 upstream.
Dev_hold has to be called always in rx_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: syzbot <syzbot+30209ea299c09d8785c9@syzkaller.appspotmail.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: Jouni Hogander <jouni.hogander@unikie.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 4e4b1036e6bc..7614a4f42bfc 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -928,14 +928,17 @@ static int rx_queue_add_kobject(struct net_device *dev, int index) struct kobject *kobj = &queue->kobj; int error = 0; + /* Kobject_put later will trigger rx_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, &rx_queue_ktype, NULL, "rx-%u", index); if (error) goto err; - dev_hold(queue->dev); - if (dev->sysfs_rx_queue_group) { error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); if (error) |