clk: mediatek: clk-mt2701: Add check for mtk_alloc_clk_data

Add the check for the return value of mtk_alloc_clk_data() in order to
avoid NULL pointer dereference.

Fixes: e986211 ("clk: mediatek: Add MT2701 clock support")
Signed-off-by: Jiasheng Jiang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Markus Schneider-Pargmann <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

Author: JiangJias

drivers/clk/mediatek/clk-mt2701.c

@@ -667,6 +667,8 @@ static int mtk_topckgen_init(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	clk_data = mtk_alloc_clk_data(CLK_TOP_NR);
+	if (!clk_data)
+		return -ENOMEM;
 
 	mtk_clk_register_fixed_clks(top_fixed_clks, ARRAY_SIZE(top_fixed_clks),
 								clk_data);
@@ -747,6 +749,8 @@ static void __init mtk_infrasys_init_early(struct device_node *node)
 
 	if (!infra_clk_data) {
 		infra_clk_data = mtk_alloc_clk_data(CLK_INFRA_NR);
+		if (!infra_clk_data)
+			return;
 
 		for (i = 0; i < CLK_INFRA_NR; i++)
 			infra_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER);
@@ -774,6 +778,8 @@ static int mtk_infrasys_init(struct platform_device *pdev)
 
 	if (!infra_clk_data) {
 		infra_clk_data = mtk_alloc_clk_data(CLK_INFRA_NR);
+		if (!infra_clk_data)
+			return -ENOMEM;
 	} else {
 		for (i = 0; i < CLK_INFRA_NR; i++) {
 			if (infra_clk_data->hws[i] == ERR_PTR(-EPROBE_DEFER))
@@ -890,6 +896,8 @@ static int mtk_pericfg_init(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	clk_data = mtk_alloc_clk_data(CLK_PERI_NR);
+	if (!clk_data)
+		return -ENOMEM;
 
 	mtk_clk_register_gates(&pdev->dev, node, peri_clks,
 			       ARRAY_SIZE(peri_clks), clk_data);