Hi Kangjie, Thanks for your patch.
On 2019-03-09 01:05:27 -0600, Kangjie Lu wrote: > In case of_match_node cannot find a match, the fix returns > -EINVAL to avoid NULL pointer dereference. > > Signed-off-by: Kangjie Lu <k...@umn.edu> > --- > drivers/media/platform/rcar-vin/rcar-core.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/media/platform/rcar-vin/rcar-core.c > b/drivers/media/platform/rcar-vin/rcar-core.c > index f0719ce24b97..a058e2023ca8 100644 > --- a/drivers/media/platform/rcar-vin/rcar-core.c > +++ b/drivers/media/platform/rcar-vin/rcar-core.c > @@ -266,6 +266,8 @@ static int rvin_group_init(struct rvin_group *group, > struct rvin_dev *vin) > > match = of_match_node(vin->dev->driver->of_match_table, > vin->dev->of_node); > + if (unlikely(!match)) > + return -EINVAL; I don't think this is needed. The driver depends on selects OF and if we get this far we it is because we had a match already. The reason to call of_match_node() here is simply to retrieve which of the possible compatible strings was matched. Am I missing something? What scenario do you see where this can fail? > > strscpy(mdev->driver_name, KBUILD_MODNAME, sizeof(mdev->driver_name)); > strscpy(mdev->model, match->compatible, sizeof(mdev->model)); > -- > 2.17.1 > -- Regards, Niklas Söderlund