From: Yang Yingliang <yangyingliang@xxxxxxxxxx> [ Upstream commit a28ed09dafee20da51eb26452950839633afd824 ] It will cause null-ptr-deref when using 'res', if platform_get_resource() returns NULL, so move using 'res' after devm_ioremap_resource() that will check it to avoid null-ptr-deref. And use devm_platform_get_and_ioremap_resource() to simplify code. Fixes: ec4ba01e894d ("mtd: rawnand: Add new Cadence NAND driver to MTD subsystem") Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx> Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx> Link: https://lore.kernel.org/linux-mtd/20220426084913.4021868-1-yangyingliang@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/mtd/nand/raw/cadence-nand-controller.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/nand/raw/cadence-nand-controller.c b/drivers/mtd/nand/raw/cadence-nand-controller.c index 7eec60ea9056..0d72672f8b64 100644 --- a/drivers/mtd/nand/raw/cadence-nand-controller.c +++ b/drivers/mtd/nand/raw/cadence-nand-controller.c @@ -2983,11 +2983,10 @@ static int cadence_nand_dt_probe(struct platform_device *ofdev) if (IS_ERR(cdns_ctrl->reg)) return PTR_ERR(cdns_ctrl->reg); - res = platform_get_resource(ofdev, IORESOURCE_MEM, 1); - cdns_ctrl->io.dma = res->start; - cdns_ctrl->io.virt = devm_ioremap_resource(&ofdev->dev, res); + cdns_ctrl->io.virt = devm_platform_get_and_ioremap_resource(ofdev, 1, &res); if (IS_ERR(cdns_ctrl->io.virt)) return PTR_ERR(cdns_ctrl->io.virt); + cdns_ctrl->io.dma = res->start; dt->clk = devm_clk_get(cdns_ctrl->dev, "nf_clk"); if (IS_ERR(dt->clk)) -- 2.35.1