Set parameters->irreversible = 0 to avoid buffer-overflow

[zodf0055980]

When using -IMF, it set parameters->irreversible = 1 in j2k:6984

if (profile == OPJ_PROFILE_IMF_2K ||
            profile == OPJ_PROFILE_IMF_4K ||
            profile == OPJ_PROFILE_IMF_8K) {
        /* 9-7 transform */
        parameters->irreversible = 1;
    }

However, when opj_j2k_is_imf_compliant return OPJ_FALSE to use Non-IMF codestream, it doesn't set parameters->irreversible to zero in j2k:7732

        if (!opj_j2k_is_imf_compliant(parameters, image, p_manager)) {
            parameters->rsiz = OPJ_PROFILE_NONE;
            // parameters->irreversible = 0;  <- fix
        }

So in opj_dwt_calc_explicit_stepsizes in dwt.c:1963, it does IMF code to cause buffer-over-flow.

        if (tccp->qntsty == J2K_CCP_QNTSTY_NOQNT) {
            stepsize = 1.0;
        } else {
            OPJ_FLOAT64 norm = opj_dwt_norms_real[orient][level];
            stepsize = (1 << (gain)) / norm;
        }

[rouault]

I don't believe this fix is correct. The issue you try to fix can probably happen in non-IMF mode

[rouault]

superseded by #1292