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1diff --git a/third_party/libopenjpeg20/tcd.c b/third_party/libopenjpeg20/tcd.c
2index f0710cd14..35d15e3d1 100644
3--- a/third_party/libopenjpeg20/tcd.c
4+++ b/third_party/libopenjpeg20/tcd.c
5@@ -1040,9 +1040,15 @@ static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
6                                                           cblkwidthexpn);
7                     l_current_precinct->ch = (OPJ_UINT32)((brcblkyend - tlcblkystart) >>
8                                                           cblkheightexpn);
9-
10+                    if (l_current_precinct->cw && ((OPJ_UINT32)-1) / l_current_precinct->cw < l_current_precinct->ch) {
11+                        return OPJ_FALSE;
12+                    }
13                     l_nb_code_blocks = l_current_precinct->cw * l_current_precinct->ch;
14                     /*fprintf(stderr, "\t\t\t\t precinct_cw = %d x recinct_ch = %d\n",l_current_precinct->cw, l_current_precinct->ch);      */
15+
16+                    if (((OPJ_UINT32)-1) / (OPJ_UINT32)sizeof_block < l_nb_code_blocks) {
17+                        return OPJ_FALSE;
18+                    }
19                     l_nb_code_blocks_size = l_nb_code_blocks * (OPJ_UINT32)sizeof_block;
20
21                     if (!l_current_precinct->cblks.blocks && (l_nb_code_blocks > 0U)) {
22