phy: mediatek: Fix missing check in mtk_mipi_tx_probe

[ Upstream commit 399c91c3f30531593e5ff6ca7b53f47092128669 ]

The of_device_get_match_data() function may return NULL.
Add check to prevent potential null dereference.

Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20211224082103.7658-1-linmq006@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
index 8cee2591e7284ba06e4a02475eba09331e47e1a2..ccc742dc78bd99a262385c0088c6c7ca48abc270 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
+++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
@@ -147,6 +147,8 @@ static int mtk_mipi_tx_probe(struct platform_device *pdev)
                return -ENOMEM;
 
        mipi_tx->driver_data = of_device_get_match_data(dev);
+       if (!mipi_tx->driver_data)
+               return -ENODEV;
 
        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        mipi_tx->regs = devm_ioremap_resource(dev, mem);