diff --git a/third_party/libopenjpeg20/j2k.c b/third_party/libopenjpeg20/j2k.c | |
index 8e343ab2e..5e1494394 100644 | |
--- a/third_party/libopenjpeg20/j2k.c | |
+++ b/third_party/libopenjpeg20/j2k.c | |
@@ -9882,6 +9882,12 @@ 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; |