problem with close after payload execution

command execshowdir

void ps4LinkCmdExecShowDir(ps4link_pkt_exec_cmd *pkg)
{
	debugNetPrintf(DEBUG,"[PS4LINK] Received command execshowdir\n");
	char *buffer;
	struct dirent *dent;
	struct stat stats;
	int dfd;
	int i;
	if(UID==0 && GID==0 && pkg->argv!=NULL)
	{
		
		dfd = open(pkg->argv, O_RDONLY, 0);
		if(dfd < 0) {
			debugNetPrintf(DEBUG, "Invalid directory.\n");
			return;
		}
		int err=fstat(dfd, &stats);
		if(err<0)
		{
			debugNetPrintf(DEBUG, "fstat error return  0x%08X \n",err);
			return;
		}
		buffer=mmap(NULL, stats.st_blksize+sizeof(struct dirent), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
		if (buffer)
		{
			// Make sure we will have a null terminated entry at the end.Thanks people leaving CryEngine code for orbis on github  :)
			for(i=0;i<stats.st_blksize+sizeof(struct dirent);i++)
			{
				buffer[i]=0;
			}
			err=getdents(dfd, buffer, stats.st_blksize);

			int nOffset = err;
			while (err > 0 && err < stats.st_blksize)
			{
				err = getdents(dfd, buffer + nOffset, stats.st_blksize-nOffset);
				nOffset += err;
			}
			
			if (err>0)
				err=0;
			
			dent = (struct dirent *)buffer;
			while(dent->d_fileno ) {
					debugNetPrintf(DEBUG, "[%s]: %s\n", entryName(dent->d_type), dent->d_name);

					dent = (struct dirent *)((void *)dent + dent->d_reclen);
			}
		}
		munmap(buffer,stats.st_blksize+sizeof(struct dirent));
		
		
		
		

		debugNetPrintf(DEBUG,"[PS4LINK] closing dfd\n");

		/*err=close(dfd);  //close is crashing i don't know why, i suppose that after knote_fdclose something is wrong and don't let close
		if(err<0)
		{
			debugNetPrintf(DEBUG, "fstat error return  0x%08X \n",err);
			return;
		}*/
	}
	else
	{
		if(pkg->argv!=NULL)
		{
			debugNetPrintf(DEBUG,"Sorry you are not root , you must be root to run this...\n");
		}
		else
		{
			debugNetPrintf(DEBUG,"Sorry you must provide a ps4 directory path...\n");
			
		}
	}
	debugNetPrintf(DEBUG,"[PS4LINK] end command execshowdir\n");
	
}