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mmc: sh_mmcif: Check for null res pointer

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commit 4d315357b3d6c315a7260420c6c6fc076e58d14b upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiasheng Jiang
2022-02-16 12:58:06 +01:00
committed by Greg Kroah-Hartman
parent 0690e28143
commit 3c74f4d3ba
1 changed files with 3 additions and 0 deletions
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drivers/mmc/host/sh_mmcif.c
+3
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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, };
res = platform_get_resource(host->pd, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
cfg.direction = direction;
if (direction == DMA_DEV_TO_MEM) {