ath6kl: wmi: use struct_size() helper

Make use of the struct_size() helper instead of an open-coded version in order to avoid any potential type mistakes, in particular in the context in which this code is being used.

So, replace code of the following form:

sizeof(*ev) + ev->num_neighbors * sizeof(struct wmi_neighbor_info)

with:

struct_size(ev, neighbor, ev->num_neighbors)

This code was detected with the help of Coccinelle.

---
 drivers/net/wireless/ath/ath6kl/wmi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

index 68854c45d0a4..39925a8f5e85 100644
@@ -1295,8 +1295,7 @@ static int ath6kl_wmi_neighbor_report_event_rx(struct wmi *wmi, u8 *datap,
 	if (len < sizeof(*ev))
 		return -EINVAL;
 	ev = (struct wmi_neighbor_report_event *) datap;
-	if (sizeof(*ev) + ev->num_neighbors * sizeof(struct wmi_neighbor_info)
-	    > len) {
+	if (struct_size(ev, neighbor, ev->num_neighbors) > len) {
 		ath6kl_dbg(ATH6KL_DBG_WMI,
 			   "truncated neighbor event (num=%d len=%d)\n",
 			   ev->num_neighbors, len);

2.21.0

Patch applied to ath-next branch of ath.git, thanks.

83d9562b6478 ath6kl: wmi: use struct_size() helper

https://patchwork.kernel.org/patch/10884343/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches