diff --git a/lib_jtag_core/src/os_interface/fs.c b/lib_jtag_core/src/os_interface/fs.c
index 3c02263..480d5d9 100644
--- a/lib_jtag_core/src/os_interface/fs.c
+++ b/lib_jtag_core/src/os_interface/fs.c
@@ -182,7 +182,7 @@ FILE *genos_fopen (const char *filename, const char *mode)
 			}
 		}
 
-		fd = genos_open (filename, rwflags|oflags, 0666);
+		fd = genos_open (filename, rwflags|oflags, (unsigned int)(0666));
 		if(fd==-1)
 			return NULL;
 
@@ -408,10 +408,11 @@ void * genos_find_first_file(char *folder, char *file, filefoundinfo* fileinfo)
 			closedir (dir);
 			dir=0;
 
+			return (void*)dir;
 		}
 
 		closedir (dir);
-		dir=0;;
+		dir=0;
 	}
 	else
 	{
diff --git a/lib_jtag_core/src/os_interface/os_interface.c b/lib_jtag_core/src/os_interface/os_interface.c
index 4226e6e..2240d24 100644
--- a/lib_jtag_core/src/os_interface/os_interface.c
+++ b/lib_jtag_core/src/os_interface/os_interface.c
@@ -269,24 +269,26 @@ int genos_createthread(jtag_core* jtag_ctx,void* hwcontext,THREADFUNCTION thread
 #ifdef WIN32
 	DWORD sit;
 	HANDLE thread_handle;
-
 	threadinit *threadinitptr;
 
+	sit = 0;
+
 	threadinitptr=(threadinit*)malloc(sizeof(threadinit));
-	threadinitptr->thread=thread;
-	threadinitptr->jtag_ctx=jtag_ctx;
-	threadinitptr->hwcontext=hwcontext;
+	if( threadinitptr )
+	{
+		threadinitptr->thread=thread;
+		threadinitptr->jtag_ctx=jtag_ctx;
+		threadinitptr->hwcontext=hwcontext;
 
-	thread_handle = CreateThread(NULL,8*1024,&ThreadProc,threadinitptr,0,&sit);
+		thread_handle = CreateThread(NULL,8*1024,&ThreadProc,threadinitptr,0,&sit);
 
-	if(!thread_handle)
-	{
-//		jtag_ctx->jtagcore_print_callback(MSG_ERROR,"genos_createthread : CreateThread failed -> 0x.8X", GetLastError());
+		if(!thread_handle)
+		{
+	//		jtag_ctx->jtagcore_print_callback(MSG_ERROR,"genos_createthread : CreateThread failed -> 0x.8X", GetLastError());
+		}
 	}
-
 	return sit;
 #else
-
 	unsigned long sit;
 	int ret;
 	pthread_t threadid;
@@ -314,17 +316,24 @@ int genos_createthread(jtag_core* jtag_ctx,void* hwcontext,THREADFUNCTION thread
 	/* set the new scheduling param */
 	pthread_attr_setschedparam (&threadattrib, &param);
 
-	threadinitptr=(threadinit *)malloc(sizeof(threadinit));
-	threadinitptr->thread=thread;
-	threadinitptr->jtag_ctx=jtag_ctx;
-	//threadinitptr->hwcontext=hwcontext;
-
 	print_callback = jtag_ctx->jtagcore_print_callback;
+	
+	threadinitptr=(threadinit *)malloc(sizeof(threadinit));
+	if(threadinitptr)
+	{
+		threadinitptr->thread=thread;
+		threadinitptr->jtag_ctx=jtag_ctx;
+		//threadinitptr->hwcontext=hwcontext;
 
-	ret = pthread_create(&threadid, &threadattrib,ThreadProc, threadinitptr);
-	if(ret)
+		ret = pthread_create(&threadid, &threadattrib,ThreadProc, threadinitptr);
+		if(ret)
+		{
+			print_callback("genos_createthread : pthread_create failed !");
+		}
+	}
+	else
 	{
-		print_callback("genos_createthread : pthread_create failed");
+		print_callback("genos_createthread : memory allocation failed !");		
 	}
 
 	return sit;
diff --git a/lib_jtag_core/src/script/env.c b/lib_jtag_core/src/script/env.c
index 3f0df61..8f016d0 100644
--- a/lib_jtag_core/src/script/env.c
+++ b/lib_jtag_core/src/script/env.c
@@ -237,13 +237,15 @@ envvar_entry * duplicate_env_vars(envvar_entry * src)
 			if(src[j].name)
 			{
 				tmp_envvars[j].name = malloc(strlen(src[j].name) + 1);
-				strcpy(tmp_envvars[j].name,src[j].name);
+				if(tmp_envvars[j].name)
+					strcpy(tmp_envvars[j].name,src[j].name);
 			}
 
 			if(src[j].varvalue)
 			{
 				tmp_envvars[j].varvalue = malloc(strlen(src[j].varvalue) + 1);
-				strcpy(tmp_envvars[j].varvalue,src[j].varvalue);
+				if(tmp_envvars[j].varvalue)
+					strcpy(tmp_envvars[j].varvalue,src[j].varvalue);
 			}
 		}
 	}