clk: samsung: Switch to use kmemdup_array()

Let the kememdup_array() take care about multiplication and possible
overflows.

Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>

Author: andy-shev

drivers/clk/samsung/clk-cpu.c

@@ -689,8 +689,8 @@ static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
 	for (num_cfgs = 0; clk_data->cfg[num_cfgs].prate != 0; )
 		num_cfgs++;
 
-	cpuclk->cfg = kmemdup(clk_data->cfg, sizeof(*clk_data->cfg) * num_cfgs,
-			      GFP_KERNEL);
+	cpuclk->cfg = kmemdup_array(clk_data->cfg, num_cfgs, sizeof(*cpuclk->cfg),
+				    GFP_KERNEL);
 	if (!cpuclk->cfg) {
 		ret = -ENOMEM;
 		goto unregister_clk_nb;

drivers/clk/samsung/clk-pll.c

@@ -1286,10 +1286,10 @@ static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx,
 			len++;
 
 		pll->rate_count = len;
-		pll->rate_table = kmemdup(pll_clk->rate_table,
-					pll->rate_count *
-					sizeof(struct samsung_pll_rate_table),
-					GFP_KERNEL);
+		pll->rate_table = kmemdup_array(pll_clk->rate_table,
+						pll->rate_count,
+						sizeof(*pll->rate_table),
+						GFP_KERNEL);
 		WARN(!pll->rate_table,
 			"%s: could not allocate rate table for %s\n",
 			__func__, pll_clk->name);