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mmc: sh_mmcif: Check for null res pointer

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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 <jiasheng@iscas.ac.cn>
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 <ulf.hansson@linaro.org>
This commit is contained in:
Jiasheng Jiang 2022-01-19 20:00:06 +08:00 committed by Ulf Hansson
parent 40c67c291a
commit 4d315357b3
1 changed files with 3 additions and 0 deletions
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3
drivers/mmc/host/sh_mmcif.c
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@ -405,6 +405,9 @@ static int sh_mmcif_dma_slave_config(struct sh_mmcif_host *host,
struct dma_slave_config cfg = { 0, }; struct dma_slave_config cfg = { 0, };
res = platform_get_resource(host->pd, IORESOURCE_MEM, 0); res = platform_get_resource(host->pd, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
cfg.direction = direction; cfg.direction = direction;
if (direction == DMA_DEV_TO_MEM) { if (direction == DMA_DEV_TO_MEM) {