c - Function with realloc crashes program after second run -

it seems after second time in function realocvet runs, error message "malloc: *** error object 0x7f8bfac039b0: pointer being realloc'd not allocated" appears.

void realocvet (float *precolist, char *nomelist, short int *quantidadelist) {     static short int p=2,n=100,q=2;     p=4*p;     n=4*n;     q=4*q;     precolist =realloc(precolist,p * sizeof(float));     nomelist =realloc(nomelist,n * sizeof(char));     quantidadelist =realloc(quantidadelist,q * sizeof(short int )); }  void insertdata (float *precolist, char *nomelist, short int *quantidadelist, struct newcard mycard) {     static short int slotsavailable = 2, aux=2,currentcard=0,nnchar=0;     short int nchar;     precolist[currentcard] = mycard.preco;     quantidadelist[currentcard] = mycard.quantidade;     (nchar=0;nchar<50;nchar++)     {         nomelist[nnchar] = mycard.nome[nchar];         nnchar++;     }     currentcard++;     slotsavailable--;      if (slotsavailable==0)     {         realocvet(precolist, nomelist, quantidadelist);         slotsavailable = aux;         aux = 2*aux;     } } 

you pass in pointer, float *precolist, realloc (potentially change). problem when return, caller still has old value of pointer.

when call function again, called old value points free'd memory.

void realocvet (float **precolist, char **nomelist, short int **quantidadelist) {     static short int p=2,n=100,q=2;     p=4*p;     n=4*n;     q=4*q;     *precolist =realloc(*precolist,p * sizeof(float));     *nomelist =realloc(*nomelist,n * sizeof(char));     *quantidadelist =realloc(*quantidadelist,q * sizeof(short int )); }