UWORD8 impeg2d_inv_quant_mpeg1(WORD16 *pi2_blk,
                              UWORD8 *pu1_weighting_matrix,
                              UWORD8 u1_quant_scale,
                              WORD32 u4_intra_flag,
                              WORD32 i4_num_coeffs,
                              WORD16 *pi2_coeffs,
                              UWORD8 *pu1_pos,
 const UWORD8 *pu1_scan,
                              UWORD16 *pu2_def_dc_pred,
                              UWORD16 u2_intra_dc_precision)
{
    UWORD16 i4_pos;

    WORD32  i4_iter;

 /* Inverse Quantize the predicted DC value for intra MB*/
 if(u4_intra_flag == 1)
 {
 /**************************************************************************/
 /* Decode the DC coefficient in case of Intra block and also update       */
 /* DC predictor value of the corresponding color component                */
 /**************************************************************************/
 {
            pi2_coeffs[0] += *pu2_def_dc_pred;
 *pu2_def_dc_pred      = pi2_coeffs[0];
            pi2_coeffs[0] <<= (3 - u2_intra_dc_precision);
            pi2_coeffs[0] = CLIP_S12(pi2_coeffs[0]);
 }

        pi2_blk[pu1_scan[0]] = pi2_coeffs[0];
 }
 /************************************************************************/
 /* Inverse quantization of other DCT coefficients                       */
 /************************************************************************/
 for(i4_iter = u4_intra_flag; i4_iter < i4_num_coeffs; i4_iter++)
 {

        WORD16 sign;
        WORD32 temp, temp1;

 /* Position is the inverse scan of the index stored */
        i4_pos      = pu1_pos[i4_iter];
        pi2_blk[i4_pos] = pi2_coeffs[i4_iter];

        sign = SIGN(pi2_blk[i4_pos]);
        temp = ABS(pi2_blk[i4_pos] << 1);

 /* pi2_coeffs has only non-zero elements. So no need to check
         * if the coeff is non-zero.
         */
        temp = temp + (1 * !u4_intra_flag);

        temp = temp * pu1_weighting_matrix[i4_pos] * u1_quant_scale;

        temp = temp >> 5;

        temp1 = temp | 1;

        temp1 = (temp1 > temp) ? (temp1 - temp) : (temp - temp1);

        temp = temp - temp1;

 if(temp < 0)
 {
            temp = 0;
 }

        temp = temp * sign;

        temp = CLIP_S12(temp);

        pi2_blk[i4_pos] = temp;
 }

 /*return value is used in the case of mpeg2 for mismatch control*/
 return (0);
} /* End of inv_quant() */

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.