On Mon, Aug 27, 2018 at 10:28:20AM +0200, Boris Brezillon wrote:
Hi Johan
On Mon, 27 Aug 2018 10:21:49 +0200 Johan Hovold johan@kernel.org wrote:
Use the new of_get_compatible_child() helper to lookup the nfc 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 a related nfc-node reference leak.
Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver") Cc: stable stable@vger.kernel.org # 4.11 Cc: Nicolas Ferre nicolas.ferre@microchip.com Cc: Josh Wu rainyfeeling@outlook.com Cc: Boris Brezillon boris.brezillon@bootlin.com Signed-off-by: Johan Hovold johan@kernel.org
Acked-by: Boris Brezillon boris.brezillon@bootlin.com
Thanks for the ack.
I'll let Miquel queue this patch to the nand/next branch, unless you want it to be merged in 4.19, in which case I'll queue it to the mtd/fixes branch.
Note that there's a dependency on the first patch of the series which adds the new helper. Rob can pick up the entire series if the various maintainers agree, otherwise I'll try to get at the least the helper into -rc2.
I'd prefer getting the use-after-frees fixed in 4.19, but queuing for 4.20 should be fine too.
Thanks, Johan