Index: clinkc/src/cybergarage/http/chttp_packet.c
===================================================================
--- clinkc.orig/src/cybergarage/http/chttp_packet.c	2014-07-03 16:47:24.563908942 +0800
+++ clinkc/src/cybergarage/http/chttp_packet.c	2014-07-03 16:50:09.327970657 +0800
@@ -499,6 +499,10 @@
 	cg_log_debug_l4("Entering...\n");
 
 	conLen = cg_http_packet_getcontentlength(httpPkt);
+	if(memory_check(conLen) == FALSE){
+		printf("upgrade firmware fail: out of memory!!!\n");
+		return FALSE;
+	}	
 	content = NULL;
 	if (0 < conLen) {
 		content = (char *)malloc(conLen+1);
@@ -603,6 +607,12 @@
 	cg_log_debug_l4("Entering...\n");
 	
 	conLen = cg_http_packet_getcontentlength(httpPkt);
+	
+	if(memory_check(conLen) == FALSE){
+		printf("upgrade firmware fail: out of memory!!!\n");
+		return FALSE;
+	}
+	
 	if (0 < conLen) {
 		fp = fopen( savedFile, "wb" );
 		if (!fp) {
@@ -700,6 +710,43 @@
 	return TRUE;
 }
 
+int get_free_memory(){
+	int size;
+	FILE *fp = NULL;
+	char *lst = calloc(128, sizeof(char));
+
+	fp = fopen("/proc/meminfo", "r");
+	if(fp != NULL){
+		while((fgets(lst, 128, fp)) != NULL) {
+			if(strstr(lst, "MemFree:") != NULL){
+				sscanf(lst, "MemFree: %d", &size);
+				break;
+			}
+		}
+
+		fclose(fp);
+	}
+	return (size*1024);
+}
+
+int memory_check(int buflen){
+	if(buflen >= get_free_memory()){
+		system("echo 1 > /proc/sys/vm/drop_caches");
+		if(buflen >= get_free_memory()){
+			system("/usr/sbin/logrotate /etc/logrotate.d/sys_logrotate.conf");
+			if(buflen >= get_free_memory()){
+				system("rm *.1");
+				system("rm zcfg.log");
+				if(buflen >= get_free_memory()){
+					return FALSE;
+				}
+			}
+		}
+	}
+
+	return TRUE;
+}
+
 static char *find_boundary(char *ptr, int buflen, char *boundary, int len){
 	int i, b;
 	if(!ptr || !boundary || len<=0  || buflen<=0 || buflen < len) return NULL;
@@ -745,6 +792,10 @@
 
 	boundaryLen = strlen(boundary);
 	conLen = cg_http_packet_getcontentlength(httpPkt);
+	if(memory_check(conLen) == FALSE){
+		printf("upgrade firmware fail: out of memory!!!\n");
+		return FALSE;
+	}
 	if (0 < conLen && conLen <= HTTPD_MAX_UPLOAD_SIZE) {
 		readLen = 0;
 		
Index: clinkc/src/cybergarage/http/chttp_request.c
===================================================================
--- clinkc.orig/src/cybergarage/http/chttp_request.c	2014-07-03 16:47:24.567908942 +0800
+++ clinkc/src/cybergarage/http/chttp_request.c	2014-07-03 16:50:20.304194426 +0800
@@ -867,8 +867,8 @@
 #if 1 //__ZYXEL__, Mark, Firmware Upgrade use orignal function, because cg_http_packet_parse_multipart is to slow
 			requestUri = cg_http_request_geturi(httpReq);
 			if(requestUri && strstr(requestUri, "/cgi-bin/Firmware_Upgrade") != NULL){
-				system("echo 1 > /proc/sys/vm/drop_caches");
-				cg_http_packet_read_body_to_file((CgHttpPacket *)httpReq, sock, lineBuf, sizeof(lineBuf), FIRMWARE_STORE_PATH);
+				if(!cg_http_packet_read_body_to_file((CgHttpPacket *)httpReq, sock, lineBuf, sizeof(lineBuf), FIRMWARE_STORE_PATH))
+					failed = TRUE;
 			}
 			else
 #endif