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

[ Upstream commit cdfaf4752e6915a4b455ad4400133e540e4dc965 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c b/drivers/media/platform/s5p-mfc/s5p_mfc.c
index c763c0a..f336a95 100644 (file)
--- a/drivers/media/platform/s5p-mfc/s5p_mfc.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c
@@ -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;
+       }
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        dev->regs_base = devm_ioremap_resource(&pdev->dev, res);