Segmentation fault on linux-working on windows

The goal of this program is to scan a string populated with numbers and white spaces between them and insert each number into an array. Then each number from the array is sent to checkPowerOfTwo function which determines if the number sent is a power of two and prints the calculation.

When I run this program on windows everything is workingfine. Running on Linux causes a segmentation fault.

I'm compiling my code on a Linux server with : gcc -std=c99 -Wall -pedantic-errors -Werror -DNDEBUG main.c -o mtm_tot. It compiles successfully with no errors or warnings. The problem arises when I try to run a tester : ./mtm_tot< test1.in > tmpout. After pressing enter on this line Segmentation fault rises.

test1.in contains : 8

5 9 -1 4 20 256 -32 17 32

The code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int checkPowerOfTwo(int x);
int main()
{
    int exp,size,sum=0,*numbers;
    char term,*str=NULL,*token;

    printf("Enter size of input:\n");
    if(scanf("%d%c", &size, &term) != 2 || term != '\n'){
        printf("Invalid Size\n");
        return 0;
    } if(size<=0){
        printf("Invalid size\n");
        return 0;
    } else{
        numbers=(int*)malloc(size * sizeof(int));
        str=(char*)malloc(sizeof(int)*(size+1) + (size-1)*sizeof(char));
        if(numbers==NULL||str==NULL){
            printf("Out of memory\n");
            return 0;
        } //else{
        //printf("Memory allocated\n");
        //}
        printf("Enter numbers:");
        fgets (str, sizeof(int)*(size+1) + (size-1), stdin);
        //printf("%s",str);
        token=strtok(str,"");
        while(token!=NULL){
            for(int i=0;i<size;i++){
                //printf("token is %s\n",token);
                //numbers[i]=token;
                sscanf(token,"%d",&numbers[i]);
                //printf("Inserting %s to the array\n ",numbers[i]);
                token=strtok(NULL,"");
            }
        }
    }

    for(int j =0;j<size;j++)
    {
        //sscanf(numbers[j],"%d",&x);
        //printf("the number im sending is : %d ",x);
        exp=checkPowerOfTwo(numbers[j]);
        if (exp>=0){
            printf("The number %d is a power of 2: %d=2^%d\n",numbers[j],numbers[j],exp);
            sum+=exp;
        }
    }
    printf("Total exponent sum is %d",sum);
    free(numbers);
    free(str);
}

int checkPowerOfTwo(int x)
{
    int exponent=0;
    //sscanf(n,"%d",&x);
    //printf("checking number %d\n",x);
    if (x==0){
        return -1;
    } if  (x==1){
        return 0;
    }
    while( x != 1)
    {
        if(x % 2 != 0){
            return -1;
        }
        x /= 2;
        exponent++;
    }
    return exponent;
}