qcacld-3.0: Optimize stack memory allocation in CSR msg processor

csr_roaming_state_msg_processor() is declaring roam_info on stack
which is of size 736 bytes. Kernel stack has limited size and all
big data structures should be allocated from heap to avoid stack
overflow. Hence allocate roam_info struct from heap and free it
after callback has returned.

Change-Id: I282d9baa9f3e679bfd5b628f0baaadf4beec86af
CRs-Fixed: 2143439

core/sme/src/csr/csr_api_roam.c

@@ -10134,7 +10134,7 @@ void csr_roaming_state_msg_processor(tpAniSirGlobal pMac, void *pMsgBuf)
 {
 	tSirSmeRsp *pSmeRsp;
 	tSmeIbssPeerInd *pIbssPeerInd;
-	struct csr_roam_info roamInfo;
+	struct csr_roam_info *roam_info;
 
 	pSmeRsp = (tSirSmeRsp *) pMsgBuf;
 	sme_debug("Message %d[0x%04X] received in substate %s",
@@ -10205,14 +10205,21 @@ void csr_roaming_state_msg_processor(tpAniSirGlobal pMac, void *pMsgBuf)
 	case eWNI_SME_IBSS_PEER_DEPARTED_IND:
 		pIbssPeerInd = (tSmeIbssPeerInd *) pSmeRsp;
 		sme_err("Peer departed ntf from LIM in joining state");
-		qdf_mem_set(&roamInfo, sizeof(struct csr_roam_info), 0);
-		roamInfo.staId = (uint8_t) pIbssPeerInd->staId;
-		roamInfo.ucastSig = (uint8_t) pIbssPeerInd->ucastSig;
-		roamInfo.bcastSig = (uint8_t) pIbssPeerInd->bcastSig;
-		qdf_copy_macaddr(&roamInfo.peerMac, &pIbssPeerInd->peer_addr);
-		csr_roam_call_callback(pMac, pSmeRsp->sessionId, &roamInfo, 0,
+		roam_info = qdf_mem_malloc(sizeof(*roam_info));
+		if (!roam_info) {
+			sme_err("failed to allocate memory for roam_info");
+			break;
+		}
+
+		roam_info->staId = (uint8_t) pIbssPeerInd->staId;
+		roam_info->ucastSig = (uint8_t) pIbssPeerInd->ucastSig;
+		roam_info->bcastSig = (uint8_t) pIbssPeerInd->bcastSig;
+		qdf_copy_macaddr(&roam_info->peerMac, &pIbssPeerInd->peer_addr);
+		csr_roam_call_callback(pMac, pSmeRsp->sessionId, roam_info, 0,
 				       eCSR_ROAM_CONNECT_STATUS_UPDATE,
 				       eCSR_ROAM_RESULT_IBSS_PEER_DEPARTED);
+		qdf_mem_free(roam_info);
+		roam_info = NULL;
 		break;
 	case eWNI_SME_GET_RSSI_REQ:
 	{