diff --git a/third_party/libopenjpeg20/j2k.c b/third_party/libopenjpeg20/j2k.c
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index b20f219..9056feb 100644
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--- a/third_party/libopenjpeg20/j2k.c
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+++ b/third_party/libopenjpeg20/j2k.c
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@@ -8211,6 +8211,12 @@ static OPJ_BOOL opj_j2k_update_image_data (opj_tcd_t * p_tcd, OPJ_BYTE * p_data,
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* */
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assert( l_res->x0 >= 0);
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assert( l_res->x1 >= 0);
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+
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+ /* Prevent bad casting to unsigned values in the subsequent lines. */
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+ if ( l_res->x0 < 0 || l_res->x1 < 0 || l_res->y0 < 0 || l_res->y1 < 0 ) {
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+ return OPJ_FALSE;
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+ }
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+
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if ( l_x0_dest < (OPJ_UINT32)l_res->x0 ) {
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l_start_x_dest = (OPJ_UINT32)l_res->x0 - l_x0_dest;
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l_offset_x0_src = 0;
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