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media: s5p-mfc: Add checking to s5p_mfc_probe().

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If of_device_get_match_data() return NULL,
then null pointer dereference occurs in  s5p_mfc_init_pm().
The patch adds checking if dev->variant is NULL.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Nadezda Lutovinova 2021-08-11 15:32:28 +02:00 committed by Mauro Carvalho Chehab
parent 7e360fa0c0
commit cdfaf4752e
1 changed files with 4 additions and 0 deletions
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4
drivers/media/platform/s5p-mfc/s5p_mfc.c
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@ -1288,6 +1288,10 @@ static int s5p_mfc_probe(struct platform_device *pdev)
}
dev->variant = of_device_get_match_data(&pdev->dev);
if (!dev->variant) {
dev_err(&pdev->dev, "Failed to get device MFC hardware variant information\n");
return -ENOENT;
}
dev->regs_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(dev->regs_base))