diff --git a/src/lib/openjp2/tcd.c b/src/lib/openjp2/tcd.c
index cba1e245..4388819a 100644
--- a/src/lib/openjp2/tcd.c
+++ b/src/lib/openjp2/tcd.c
@@ -1578,7 +1578,13 @@ OPJ_BOOL opj_tcd_mct_decode ( opj_tcd_t *p_tcd )
         l_samples = (l_tile_comp->x1 - l_tile_comp->x0) * (l_tile_comp->y1 - l_tile_comp->y0);
 
         if (l_tile->numcomps >= 3 ){
-                if (l_tcp->mct == 2) {
+                /* testcase 1336.pdf.asan.47.376 */
+                if ((l_tile->comps[0].x1 - l_tile->comps[0].x0) * (l_tile->comps[0].y1 - l_tile->comps[0].y0) < (OPJ_INT32)l_samples ||
+                    (l_tile->comps[1].x1 - l_tile->comps[1].x0) * (l_tile->comps[1].y1 - l_tile->comps[1].y0) < (OPJ_INT32)l_samples ||
+                    (l_tile->comps[2].x1 - l_tile->comps[2].x0) * (l_tile->comps[2].y1 - l_tile->comps[2].y0) < (OPJ_INT32)l_samples) {
+                        fprintf(stderr, "Tiles don't all have the same dimension. Skip the MCT step.\n");
+                }
+                else if (l_tcp->mct == 2) {
                         OPJ_BYTE ** l_data;
 
                         if (! l_tcp->m_mct_decoding_matrix) {
@@ -1659,6 +1665,8 @@ OPJ_BOOL opj_tcd_dc_level_shift_decode ( opj_tcd_t *p_tcd )
                 l_height = (l_res->y1 - l_res->y0);
                 l_stride = (l_tile_comp->x1 - l_tile_comp->x0) - l_width;
 
+                assert(l_height == 0 || l_width + l_stride <= l_tile_comp->data_size / l_height); /*MUPDF*/
+
                 if (l_img_comp->sgnd) {
                         l_min = -(1 << (l_img_comp->prec - 1));
                         l_max = (1 << (l_img_comp->prec - 1)) - 1;