qcacld-3.0: Fix memory leak in sme_rrm_issue_scan_req

Function sme_rrm_issue_scan_req issues scan request, which consumes
an allocated channel list and frees it later. It should also free the
scan list in same context for all the paths that do not issue the scan
request or when the channel list is parsed completely. Fix the memory
leak by making sure all such paths where scan request is not issued,
channel list is freed.

Change-Id: I561c3e03beaa5a809b5be1dd0c9dc73312e3c102
CRs-Fixed: 2166647

core/sme/src/rrm/sme_rrm.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011-2017 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2011-2018 The Linux Foundation. All rights reserved.
  *
  * Previously licensed under the ISC license by Qualcomm Atheros, Inc.
  *
@@ -692,12 +692,15 @@ static QDF_STATUS sme_rrm_issue_scan_req(tpAniSirGlobal mac_ctx)
 	if (status != QDF_STATUS_SUCCESS) {
 		sme_err("sme session ID not found for bssid= "MAC_ADDRESS_STR,
 			MAC_ADDR_ARRAY(sme_rrm_ctx->sessionBssId.bytes));
-		return QDF_STATUS_E_FAILURE;
+		status = QDF_STATUS_E_FAILURE;
+		goto free_ch_lst;
 	}
 
 	if ((sme_rrm_ctx->currentIndex) >=
-			sme_rrm_ctx->channelList.numOfChannels)
-		return status;
+			sme_rrm_ctx->channelList.numOfChannels) {
+		sme_debug("done with the complete ch lt. finish and fee now");
+		goto free_ch_lst;
+	}
 
 	if (eRRM_MSG_SOURCE_ESE_UPLOAD == sme_rrm_ctx->msgSource ||
 		eRRM_MSG_SOURCE_LEGACY_ESE == sme_rrm_ctx->msgSource)
@@ -803,6 +806,8 @@ static QDF_STATUS sme_rrm_issue_scan_req(tpAniSirGlobal mac_ctx)
 					sme_rrm_ctx->currentIndex]);
 		status = ucfg_scan_start(req);
 		wlan_objmgr_vdev_release_ref(vdev, WLAN_LEGACY_SME_ID);
+
+		return status;
 	} else if (eSIR_BEACON_TABLE == scan_type) {
 		/*
 		 * In beacon table mode, scan results are taken directly from
@@ -823,6 +828,7 @@ static QDF_STATUS sme_rrm_issue_scan_req(tpAniSirGlobal mac_ctx)
 #ifdef FEATURE_WLAN_ESE
 			sme_rrm_ctx->eseBcnReqInProgress = false;
 #endif
+			return status;
 		} else {
 			/*
 			 * Done with the measurement. Clean up all context and
@@ -831,7 +837,7 @@ static QDF_STATUS sme_rrm_issue_scan_req(tpAniSirGlobal mac_ctx)
 			sme_rrm_send_scan_result(mac_ctx, 1,
 				&sme_rrm_ctx->channelList.ChannelList[
 					sme_rrm_ctx->currentIndex], true);
-			qdf_mem_free(sme_rrm_ctx->channelList.ChannelList);
+			goto free_ch_lst;
 		}
 	} else {
 		sme_err("Unknown beacon report req mode(%d)", scan_type);
@@ -841,7 +847,12 @@ static QDF_STATUS sme_rrm_issue_scan_req(tpAniSirGlobal mac_ctx)
 		 * and PE will not handle subsequent Beacon requests
 		 */
 		sme_rrm_send_beacon_report_xmit_ind(mac_ctx, NULL, true, 0);
+		goto free_ch_lst;
 	}
+
+free_ch_lst:
+	qdf_mem_free(sme_rrm_ctx->channelList.ChannelList);
+	sme_rrm_ctx->channelList.ChannelList = NULL;
 	return status;
 }
 
@@ -863,7 +874,6 @@ QDF_STATUS sme_rrm_process_beacon_report_req_ind(tpAniSirGlobal pMac,
 	tpSirBeaconReportReqInd pBeaconReq = (tpSirBeaconReportReqInd) pMsgBuf;
 	tpRrmSMEContext pSmeRrmContext = &pMac->rrm.rrmSmeContext;
 	uint32_t len = 0, i = 0;
-	QDF_STATUS status = QDF_STATUS_SUCCESS;
 
 	sme_debug("Received Beacon report request ind Channel = %d",
 		pBeaconReq->channelInfo.channelNum);
@@ -955,16 +965,7 @@ QDF_STATUS sme_rrm_process_beacon_report_req_ind(tpAniSirGlobal pMac,
 		pSmeRrmContext->token, pSmeRrmContext->regClass,
 		pSmeRrmContext->randnIntvl, pSmeRrmContext->msgSource);
 
-	status = sme_rrm_issue_scan_req(pMac);
-
-	if (status != QDF_STATUS_SUCCESS) {
-		if (pSmeRrmContext->channelList.ChannelList) {
-			qdf_mem_free(pSmeRrmContext->channelList.ChannelList);
-			pSmeRrmContext->channelList.ChannelList = NULL;
-		}
-	}
-
-	return status;
+	return sme_rrm_issue_scan_req(pMac);
 }
 
 /**