 ptaReadStream(FILE  *fp)
 {
char       typestr[128];
 l_int32    i, n, ix, iy, type, version;
 l_float32  x, y;
 PTA       *pta;

    PROCNAME("ptaReadStream");

    if (!fp)
        return (PTA *)ERROR_PTR("stream not defined", procName, NULL);

    if (fscanf(fp, "\n Pta Version %d\n", &version) != 1)
         return (PTA *)ERROR_PTR("not a pta file", procName, NULL);
     if (version != PTA_VERSION_NUMBER)
         return (PTA *)ERROR_PTR("invalid pta version", procName, NULL);
    if (fscanf(fp, " Number of pts = %d; format = %s\n", &n, typestr) != 2)
         return (PTA *)ERROR_PTR("not a pta file", procName, NULL);
     if (!strcmp(typestr, "float"))
         type = 0;
    else  /* typestr is "integer" */
        type = 1;

    if ((pta = ptaCreate(n)) == NULL)
        return (PTA *)ERROR_PTR("pta not made", procName, NULL);
    for (i = 0; i < n; i++) {
        if (type == 0) {  /* data is float */
            if (fscanf(fp, "   (%f, %f)\n", &x, &y) != 2) {
                ptaDestroy(&pta);
                return (PTA *)ERROR_PTR("error reading floats", procName, NULL);
            }
            ptaAddPt(pta, x, y);
        } else {   /* data is integer */
            if (fscanf(fp, "   (%d, %d)\n", &ix, &iy) != 2) {
                ptaDestroy(&pta);
                return (PTA *)ERROR_PTR("error reading ints", procName, NULL);
            }
            ptaAddPt(pta, ix, iy);
        }
    }

    return pta;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.