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1diff --git a/third_party/libopenjpeg20/j2k.c b/third_party/libopenjpeg20/j2k.c
2index b20f219..9056feb 100644
3--- a/third_party/libopenjpeg20/j2k.c
4+++ b/third_party/libopenjpeg20/j2k.c
5@@ -8211,6 +8211,12 @@ static OPJ_BOOL opj_j2k_update_image_data (opj_tcd_t * p_tcd, OPJ_BYTE * p_data,
6                  * */
7                 assert( l_res->x0 >= 0);
8                 assert( l_res->x1 >= 0);
9+
10+                /* Prevent bad casting to unsigned values in the subsequent lines. */
11+                if ( l_res->x0 < 0 || l_res->x1 < 0 || l_res->y0 < 0 || l_res->y1 < 0 ) {
12+                        return OPJ_FALSE;
13+                }
14+
15                 if ( l_x0_dest < (OPJ_UINT32)l_res->x0 ) {
16                         l_start_x_dest = (OPJ_UINT32)l_res->x0 - l_x0_dest;
17                         l_offset_x0_src = 0;
18