This is a fix for https://bugzilla.mozilla.org/show_bug.cgi?id=1274083

diff --git a/src/resample.c b/src/resample.c
--- a/src/resample.c
+++ b/src/resample.c
@@ -1129,18 +1129,19 @@ EXPORT int speex_resampler_set_rate_frac
 
    st->num_rate /= fact;
    st->den_rate /= fact;
 
    if (old_den > 0)
    {
       for (i=0;i<st->nb_channels;i++)
       {
-         if (multiply_frac(&st->samp_frac_num[i],st->samp_frac_num[i],st->den_rate,old_den) != RESAMPLER_ERR_SUCCESS)
-            return RESAMPLER_ERR_OVERFLOW;
+         if (multiply_frac(&st->samp_frac_num[i],st->samp_frac_num[i],st->den_rate,old_den) != RESAMPLER_ERR_SUCCESS) {
+            st->samp_frac_num[i] = st->den_rate-1;
+         }
          /* Safety net */
          if (st->samp_frac_num[i] >= st->den_rate)
             st->samp_frac_num[i] = st->den_rate-1;
       }
    }
 
    if (st->initialised)
       return update_filter(st);