diff options
| author | Oliver Neukum <oneukum@suse.com> | 2019-05-09 04:57:09 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-04 09:35:02 +0200 |
| commit | 63a80df0ea2b94813f60e8372f9ee93856bcfd5b (patch) | |
| tree | a661c654ef5652e0b26e543116d5ef15c1170fc8 | |
| parent | 4ef54f331818f5d651e18fd640ec47d0b6eebf46 (diff) | |
media: cpia2_usb: first wake up, then free in disconnect
commit eff73de2b1600ad8230692f00bc0ab49b166512a upstream.
Kasan reported a use after free in cpia2_usb_disconnect()
It first freed everything and then woke up those waiting.
The reverse order is correct.
Fixes: 6c493f8b28c67 ("[media] cpia2: major overhaul to get it in a working state again")
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reported-by: syzbot+0c90fc937c84f97d0aa6@syzkaller.appspotmail.com
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/media/usb/cpia2/cpia2_usb.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/media/usb/cpia2/cpia2_usb.c b/drivers/media/usb/cpia2/cpia2_usb.c index 351a78a84c3d..41ea00ac3a87 100644 --- a/drivers/media/usb/cpia2/cpia2_usb.c +++ b/drivers/media/usb/cpia2/cpia2_usb.c @@ -884,7 +884,6 @@ static void cpia2_usb_disconnect(struct usb_interface *intf) cpia2_unregister_camera(cam); v4l2_device_disconnect(&cam->v4l2_dev); mutex_unlock(&cam->v4l2_lock); - v4l2_device_put(&cam->v4l2_dev); if(cam->buffers) { DBG("Wakeup waiting processes\n"); @@ -897,6 +896,8 @@ static void cpia2_usb_disconnect(struct usb_interface *intf) DBG("Releasing interface\n"); usb_driver_release_interface(&cpia2_driver, intf); + v4l2_device_put(&cam->v4l2_dev); + LOG("CPiA2 camera disconnected.\n"); } |