On Mon, 26 Nov 2018 19:46:15 +0530 Naresh Kamboju naresh.kamboju@linaro.org wrote:
Do you see build failure arm x15 beagleboard on 4.14 due to this patch ?
On Mon, 26 Nov 2018 at 16:31, Greg Kroah-Hartman gregkh@linuxfoundation.org wrote:
4.14-stable review patch. If anyone has any objections, please let me know.
From: Johan Hovold johan@kernel.org
commit 5d1e9c2212ea6b4dd735e4fc3dd6279a365d5d10 upstream.
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 Signed-off-by: Boris Brezillon boris.brezillon@bootlin.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
drivers/mtd/nand/atmel/nand-controller.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/mtd/nand/atmel/nand-controller.c +++ b/drivers/mtd/nand/atmel/nand-controller.c @@ -2077,8 +2077,7 @@ atmel_hsmc_nand_controller_legacy_init(s int ret;
nand_np = dev->of_node;
nfc_np = of_find_compatible_node(dev->of_node, NULL,"atmel,sama5d3-nfc");
nfc_np = of_get_compatible_child(dev->of_node, "atmel,sama5d3-nfc"); if (!nfc_np) { dev_err(dev, "Could not find device node for sama5d3-nfc\n"); return -ENODEV;@@ -2492,15 +2491,19 @@ static int atmel_nand_controller_probe(s }
if (caps->legacy_of_bindings) {
struct device_node *nfc_node; u32 ale_offs = 21; /* * If we are parsing legacy DT props and the DT contains a * valid NFC node, forward the request to the sama5 logic. */
if (of_find_compatible_node(pdev->dev.of_node, NULL,"atmel,sama5d3-nfc"))
nfc_node = of_get_compatible_child(pdev->dev.of_node,"atmel,sama5d3-nfc");if (nfc_node) { caps = &atmel_sama5_nand_caps;of_node_put(nfc_node);} /* * Even if the compatible says we are dealing with an/drivers/mtd/nand/atmel/nand-controller.c: In function 'atmel_hsmc_nand_controller_legacy_init': /drivers/mtd/nand/atmel/nand-controller.c:2080:11: error: implicit declaration of function 'of_get_compatible_child'; did you mean 'of_get_next_available_child'? [-Werror=implicit-function-declaration] nfc_np = of_get_compatible_child(dev->of_node, "atmel,sama5d3-nfc");
Looks like of_get_compatible_child() has been introduced in 4.18, hence this error.
Greg, can you drop this patch from 4.14.y?