diff options
| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-10-21 17:57:20 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-22 08:50:37 +0300 |
| commit | 4a215aade0baa0487d4644d7aef6f166c84c516e (patch) | |
| tree | 3cf126e431235d21fdf565e2d39089397680e803 /drivers/input/evdev.c | |
| parent | 2f0157f13f42800aa3d9017ebb0fb80a65f7b2de (diff) | |
| download | lwn-4a215aade0baa0487d4644d7aef6f166c84c516e.tar.gz lwn-4a215aade0baa0487d4644d7aef6f166c84c516e.zip | |
Input: fix use-after-free introduced with dynamic minor changes
Commit 7f8d4cad1e4e ("Input: extend the number of event (and other)
devices") made evdev, joydev and mousedev to embed struct cdev into
their respective structures representing input devices.
Unfortunately character device structure may outlive the parent
structure unless we do not set it up as parent of character device so
that it will stay pinned until character device is freed.
Also, now that parent structure is pinned while character device exists
we do not need to pin and unpin it every time user opens or closes it.
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/input/evdev.c')
| -rw-r--r-- | drivers/input/evdev.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 6ae2ac47c9c8..f0f8928b3c8a 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -292,7 +292,6 @@ static int evdev_release(struct inode *inode, struct file *file) kfree(client); evdev_close_device(evdev); - put_device(&evdev->dev); return 0; } @@ -331,7 +330,6 @@ static int evdev_open(struct inode *inode, struct file *file) file->private_data = client; nonseekable_open(inode, file); - get_device(&evdev->dev); return 0; err_free_client: @@ -1001,6 +999,7 @@ static int evdev_connect(struct input_handler *handler, struct input_dev *dev, goto err_free_evdev; cdev_init(&evdev->cdev, &evdev_fops); + evdev->cdev.kobj.parent = &evdev->dev.kobj; error = cdev_add(&evdev->cdev, evdev->dev.devt, 1); if (error) goto err_unregister_handle; |