Segmentation fault in recursive function, while parsing directories - c

Question

I am trying to make a program that returns the total size of a directory. The program takes the path to the directory, parses it, if it finds a file(done using a function) it adds the size, else
I recall the function. After some debugging i found out that the line containing the call to the recursive function give a segmentation fault and i have absolutely no idea how to fix it.
my code
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
int isDirectory(const char* fileName) {
DIR* dir=opendir(fileName);
if(dir!=NULL) {
closedir(dir);
return 1;
} else if(errno == ENOTDIR) {
return 0;
} else return -1;
closedir(dir);
}
int getFileSize(char* fileName) {
FILE* file;
file=fopen(fileName,"r");
fseek(file,0,SEEK_END);
int size=ftell(file);
fclose(file);
return size;
}
int getAllSize(char* dirName) {
DIR* dir;
char* name=dirName;
int size=0;
struct dirent *dent;
dir=opendir(dirName);
if(dir!=NULL) {
while((dent=readdir(dir))!=NULL) {
char help[1000000];
memset(help,0,sizeof help);
if(strcmp(dent->d_name,"..") && strcmp(dent->d_name,".")) {
strcat(help,name);
strcat(help,"/");
strcat(help,dent->d_name);
printf("%s\n",help);
if(isDirectory(help)==1) {
getAllSize(name);
} else{
printf("before %d\n",size);
size+=getFileSize(help);
printf("after %d\n",size);
}
}
}
} else {
printf("sal1\n");
}
closedir(dir);
printf("%d",size);
return size;
}
int main(int argc,char** argv) {
getAllSize("/home/rares/Documents/OS/Lab3");
return 0;
}