pcre memory bug

mainPageCredRx=pcre_compile("class=\"credits_value\"[^<>]*>(\\d+)</sp",PCRE_CASELESS,&pcreErr,&pcreErrOffset,NULL);//so i need array of 4 integers : 2 for pattern and 2 for subpattern
mainPageCredRxExtr=pcre_study(mainPageCredRx,0,&pcreErr);
.....
{
int poss[5];//with a small margin
char *cstr=(char*)buf.c_str();
int flds=pcre_exec(mainPageCredRx,mainPageCredRxExtr,cstr,buf.length(),0,0,poss,5);
/*we got:
flds=0
poss :
        [0] 5212    int
        [1] 5238    int
        [2] -1  int
        [3] -1  int
        [4] -858993460  int

*/
}
{
int poss[10];//with a small margin
int flds=pcre_exec(mainPageCredRx,mainPageCredRxExtr,cstr,buf.length(),0,0,poss,10);
/*we got:
flds=2
poss :
        [0] 5212    int
        [1] 5238    int
        [2] 5230    int
        [3] 5234    int
        [4] -858993460  int
        [5] -858993460  int
        [6] -858993460  int
        [7] -858993460  int
        [8] 5230    int
        [9] -858993460  int


*/}