qcacld-3.0: Fix possible integer underflow in cfg80211_rx_mgmt

In the function cfg80211_rx_mgmt, data_len is calculated as
len - ieee80211_hdrlen(mgmt->frame_control). Len is not
validated before this calculation. So a possible integer
underflow will occur if len value is less than the value of
ieee80211_hdrlen(mgmt->frame_control).

Validate the value of len against
ieee80211_hdrlen(mgmt->frame_control) in the caller.

Change-Id: Iae776daf37b0c052bd4ce4da44ea728d121eae51
CRs-Fixed: 2263758

core/hdd/src/wlan_hdd_main.c

@@ -8582,11 +8582,18 @@ void hdd_indicate_mgmt_frame(tSirSmeMgmtFrameInd *frame_ind)
 	struct hdd_context *hdd_ctx = NULL;
 	struct hdd_adapter *adapter = NULL;
 	int i;
+	struct ieee80211_mgmt *mgmt =
+		(struct ieee80211_mgmt *)frame_ind->frameBuf;
 
 	hdd_ctx = cds_get_context(QDF_MODULE_ID_HDD);
 	if (wlan_hdd_validate_context(hdd_ctx))
 		return;
 
+	if (frame_ind->frame_len < ieee80211_hdrlen(mgmt->frame_control)) {
+		hdd_err(" Invalid frame length");
+		return;
+	}
+
 	if (SME_SESSION_ID_ANY == frame_ind->sessionId) {
 		for (i = 0; i < CSR_ROAM_SESSION_MAX; i++) {
 			adapter =