Reallocing gives me a segmentation fault...

I try to dynamacly allocate memory during run time since i don't know how much memory I need when I start the prog since it is up to the user (trying to make a text editor) so I have to dynamacly allocate memory alot, I have made a board search but didn't find anything which made the program work and i googled it. Anyway here is the code which won't work:

Code:

---

if (cheak>=pline)
/*kolla ifall mer minne behövs*/
 {
 wprintw(win," %d %d",pline,cheak);
 pline++;
 wprintw(win," %d",pline);
 
 store=realloc (buff,pline*sizeof(int));
 if(store == NULL)
  {
  endwin ();
  printf("Not enuf free memory\n");
  exit(0);
  }

 buff=store;
 buff [pline]=calloc((pcol+1),sizeof(int));
 if(buff [pline] == NULL)
  {
  endwin();
  printf("not enuf free memory\n");
  exit(0);
  }
 
 free(store);
 store=NULL;

 wprintw(win,"allocating ok! %p %p %p",store,buff [pline],buff);
 }
buff [cheak] [j-1] = ch;

---

both buff and point are int **. I have tryed everything I can think of which might work...

ah okey thx a ton for the help :) Should I change it when i malloc the memory for buff the first time so it is sizeof(int*) there aswell?

it still gets segmentation fault :(

I've done some small changes now (added a new variable to keep track of somthing instad of using an other one ment for somthing else (and set cheak back to 0 (it keeps track of where I should write)) and now I can print 3 rows and then it my wprintw statement comes that it allocated ok and when I am at the end of the 4:th row it crashes, although I try to print somtihng on that line I get segment fault. I guess I get it when I try to do the buff [cheak] [cheak2] = ch; so...is there any better way to cheak if I got the memory then the one I'm using?

Code:

---

store=realloc (buff,pline*sizeof(int));

 ...

 buff=store;
 buff [pline]=calloc((pcol+1),sizeof(int));

---

Let's say pline equals 5. Five elements means you can use elements 0 to 4. You use element five. Bad idea.

ah okey forgot that! thx a ton for the help!