ASoC: SOF: topology: Use kmemdup_array instead of kmemdup for multipl…

…e allocation

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

Using kmemdup_array() is more appropriate and makes the code
easier to audit.

Signed-off-by: Shen Lichuan <shenlichuan@vivo.com>
Link: https://patch.msgid.link/20240826054402.58396-1-shenlichuan@vivo.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/topology.c

@@ -1349,7 +1349,7 @@ static int sof_parse_pin_binding(struct snd_sof_widget *swidget,
 
 	/* copy pin binding array to swidget only if it is defined in topology */
 	if (pin_binding[0]) {
-		pb = kmemdup(pin_binding, num_pins * sizeof(char *), GFP_KERNEL);
+		pb = kmemdup_array(pin_binding, num_pins, sizeof(char *), GFP_KERNEL);
 		if (!pb) {
 			ret = -ENOMEM;
 			goto err;
@@ -1889,9 +1889,9 @@ static int sof_link_load(struct snd_soc_component *scomp, int index, struct snd_
 		return -ENOMEM;
 
 	slink->num_hw_configs = le32_to_cpu(cfg->num_hw_configs);
-	slink->hw_configs = kmemdup(cfg->hw_config,
-				    sizeof(*slink->hw_configs) * slink->num_hw_configs,
-				    GFP_KERNEL);
+	slink->hw_configs = kmemdup_array(cfg->hw_config,
+					  slink->num_hw_configs, sizeof(*slink->hw_configs),
+					  GFP_KERNEL);
 	if (!slink->hw_configs) {
 		kfree(slink);
 		return -ENOMEM;