Hi Laurent and Gjorgji, On Mon, Dec 07, 2015 at 10:45:39AM +0200, Laurent Pinchart wrote: > From: Gjorgji Rosikopulos <grosikopu...@mm-sol.com> > > Buffer length is needed for single plane as well, otherwise > is uninitialized and behaviour is undetermined.
How about: The v4l2_buffer length field must be passed as well from user to kernel and back, otherwise uninitialised values will be used. > > Signed-off-by: Gjorgji Rosikopulos <grosikopu...@mm-sol.com> > Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com> Acked-by: Sakari Ailus <sakari.ai...@linux.intel.com> Shouldn't this be submitted to stable as well? > --- > drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c > b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c > index 8fd84a67478a..b0faa1f7e3a9 100644 > --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c > +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c > @@ -482,8 +482,10 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp, > struct v4l2_buffer32 __user > return -EFAULT; > break; > case V4L2_MEMORY_DMABUF: > - if (get_user(kp->m.fd, &up->m.fd)) > + if (get_user(kp->m.fd, &up->m.fd) || > + get_user(kp->length, &up->length)) > return -EFAULT; > + > break; > } > } > @@ -550,7 +552,8 @@ static int put_v4l2_buffer32(struct v4l2_buffer *kp, > struct v4l2_buffer32 __user > return -EFAULT; > break; > case V4L2_MEMORY_DMABUF: > - if (put_user(kp->m.fd, &up->m.fd)) > + if (put_user(kp->m.fd, &up->m.fd) || > + put_user(kp->length, &up->length)) > return -EFAULT; > break; > } -- Kind regards, Sakari Ailus e-mail: sakari.ai...@iki.fi XMPP: sai...@retiisi.org.uk -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
