Hi Ricardo, On Wed, Sep 21, 2022 at 09:51:44AM +0200, Ricardo Ribalda wrote: > Do you mean something like this? > > diff --git a/drivers/media/usb/uvc/uvc_entity.c > b/drivers/media/usb/uvc/uvc_entity.c > index 7c4d2f93d351..66d1f5da4ec7 100644 > --- a/drivers/media/usb/uvc/uvc_entity.c > +++ b/drivers/media/usb/uvc/uvc_entity.c > @@ -37,7 +37,7 @@ static int uvc_mc_create_links(struct uvc_video_chain *chain, > continue; > > remote = uvc_entity_by_id(chain->dev, entity->baSourceID[i]); > - if (remote == NULL) > + if (remote == NULL || remote->num_pads == 0) > return -EINVAL; Yes. > > source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING) > @@ -46,6 +46,9 @@ static int uvc_mc_create_links(struct uvc_video_chain *chain, > if (source == NULL) > continue; > > + if (source->num_pads != remote->num_pads) > + return -EINVAL; > + But this I would have dropped, as the media_entity num_pads is initialized from uvc_entity num_pads and neither are changed after. > remote_pad = remote->num_pads - 1; > ret = media_create_pad_link(source, remote_pad, > sink, i, flags); > > regarding making a new patch, whatever is easier for you ;) > > > On Wed, 21 Sept 2022 at 02:53, Laurent Pinchart wrote: > > > > Hi Ricardo, > > > > Thank you for the patch. > > > > On Tue, Sep 20, 2022 at 04:04:55PM +0200, Ricardo Ribalda wrote: > > > If the source entity does not contain any pads, do not create a link. > > > > > > Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx> > > > Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx> > > > > > > diff --git a/drivers/media/usb/uvc/uvc_entity.c b/drivers/media/usb/uvc/uvc_entity.c > > > index 7c4d2f93d351..1f730cb72e58 100644 > > > --- a/drivers/media/usb/uvc/uvc_entity.c > > > +++ b/drivers/media/usb/uvc/uvc_entity.c > > > @@ -43,7 +43,7 @@ static int uvc_mc_create_links(struct uvc_video_chain *chain, > > > source = (UVC_ENTITY_TYPE(remote) == UVC_TT_STREAMING) > > > ? (remote->vdev ? &remote->vdev->entity : NULL) > > > : &remote->subdev.entity; > > > - if (source == NULL) > > > + if (source == NULL || source->num_pads == 0) > > > > source->num_pads and remote->num_pads should always be identical, but as > > the next line uses remote->num_pads, wouldn't it be better to test that > > variable ? If so, I'd move the test a file lines earlier, with the > > remote == NULL test. > > > > What do you think ? If you agree I can make that change when applying, > > there's no need for a new version. Otherwise I'll keep the patch as-is. > > > > > continue; > > > > > > remote_pad = remote->num_pads - 1; > > > -- Regards, Laurent Pinchart
