On Mon, May 22, 2017 at 12:48:04PM -0700, Guenter Roeck wrote: > From: Robb Glasser <rglasser@xxxxxxxxxx> > > The size of uvc_control_mapping is user controlled leading to a > potential heap overflow in the uvc driver. This adds a check to verify > the user provided size fits within the bounds of the defined buffer > size. > > Signed-off-by: Robb Glasser <rglasser@xxxxxxxxxx> > [groeck: cherry picked from > https://source.codeaurora.org/quic/la/kernel/msm-3.10 > commit b7b99e55bc7770187913ed092990852ea52d7892; > updated subject] > Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> > --- > Fixes CVE-2017-0627. > Please do not apply this patch. It is buggy. Guenter > drivers/media/usb/uvc/uvc_ctrl.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c > index c2ee6e39fd0c..252ab991396f 100644 > --- a/drivers/media/usb/uvc/uvc_ctrl.c > +++ b/drivers/media/usb/uvc/uvc_ctrl.c > @@ -1992,6 +1992,9 @@ int uvc_ctrl_add_mapping(struct uvc_video_chain *chain, > if (!found) > return -ENOENT; > > + if (ctrl->info.size < mapping->size) > + return -EINVAL; > + > if (mutex_lock_interruptible(&chain->ctrl_mutex)) > return -ERESTARTSYS; >
