On Mon, Aug 27, 2018 at 04:44:44PM +0200, Ulf Hansson wrote: > On 27 August 2018 at 10:21, Johan Hovold <jo...@kernel.org> wrote: > > Use the new of_get_compatible_child() helper to lookup the slot child > > node instead of using of_find_compatible_node(), which searches the > > entire tree from a given start node and thus can return an unrelated > > (i.e. non-child) node. > > > > This also addresses a potential use-after-free (e.g. after probe > > deferral) as the tree-wide helper drops a reference to its first > > argument (i.e. the node of the device being probed). > > > > While at it, also fix up the related slot-node reference leak. > > > > Fixes: ed80a13bb4c4 ("mmc: meson-mx-sdio: Add a driver for the Amlogic > > Meson8 and Meson8b SoCs") > > Cc: stable <sta...@vger.kernel.org> # 4.15 > > Cc: Carlo Caione <ca...@endlessm.com> > > Cc: Martin Blumenstingl <martin.blumensti...@googlemail.com> > > Cc: Ulf Hansson <ulf.hans...@linaro.org> > > Acked-by: Martin Blumenstingl <martin.blumensti...@googlemail.com> > > Signed-off-by: Johan Hovold <jo...@kernel.org> > > Acked-by: Ulf Hansson <ulf.hans...@linaro.org>
Thanks for the ack. Rob's gotten the helper into -rc2, so feel free to pick this one up directly to whichever mmc branch you prefer. I've been able to trigger crashes after probe deferrals due to the use-after-free, but this seems unlikely to be exploitable. Thanks, Johan