| diff --git a/third_party/libopenjpeg20/j2k.c b/third_party/libopenjpeg20/j2k.c |
| index ad6e1b86f..bf1cb4f36 100644 |
| --- a/third_party/libopenjpeg20/j2k.c |
| +++ b/third_party/libopenjpeg20/j2k.c |
| @@ -9086,6 +9086,12 @@ static OPJ_BOOL opj_j2k_update_image_data(opj_tcd_t * p_tcd, |
| * */ |
| assert(res_x0 >= 0); |
| assert(res_x1 >= 0); |
| + |
| + /* Prevent bad casting to unsigned values in the subsequent lines. */ |
| + if ( res_x0 < 0 || res_x1 < 0 || res_y0 < 0 || res_y1 < 0 ) { |
| + return OPJ_FALSE; |
| + } |
| + |
| if (l_x0_dest < (OPJ_UINT32)res_x0) { |
| l_start_x_dest = (OPJ_UINT32)res_x0 - l_x0_dest; |
| l_offset_x0_src = 0; |