From 4d315357b3d6c315a7260420c6c6fc076e58d14b Mon Sep 17 00:00:00 2001 From: Jiasheng Jiang Date: Wed, 19 Jan 2022 20:00:06 +0800 Subject: [PATCH] mmc: sh_mmcif: Check for null res pointer If there is no suitable resource, platform_get_resource() will return NULL. Therefore in order to avoid the dereference of the NULL pointer, it should be better to check the 'res'. Signed-off-by: Jiasheng Jiang Cc: stable@vger.kernel.org # v5.16+ Link: https://lore.kernel.org/r/20220119120006.1426964-1-jiasheng@iscas.ac.cn Signed-off-by: Ulf Hansson --- drivers/mmc/host/sh_mmcif.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c index bcc595c..104dcd7 100644 --- a/drivers/mmc/host/sh_mmcif.c +++ b/drivers/mmc/host/sh_mmcif.c @@ -405,6 +405,9 @@ static int sh_mmcif_dma_slave_config(struct sh_mmcif_host *host, struct dma_slave_config cfg = { 0, }; res = platform_get_resource(host->pd, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; + cfg.direction = direction; if (direction == DMA_DEV_TO_MEM) { -- 2.7.4