diff --git a/thirdparty/stb_image/include/stb_image/stb_image.h b/thirdparty/stb_image/include/stb_image/stb_image.h
index 86a4ae4..bdc93a3 100644
--- a/thirdparty/stb_image/include/stb_image/stb_image.h
+++ b/thirdparty/stb_image/include/stb_image/stb_image.h
@@ -3245,6 +3245,13 @@ static int stbi__process_frame_header(stbi__jpeg *z, int scan)
 	  if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
 	  if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
    }
+   
+   // check that plane subsampling factors are integer ratios; our resamplers can't deal with fractional ratios
+   // and I've never seen a non-corrupted JPEG file actually use them
+   for (i=0; i < s->img_n; ++i) {
+      if (h_max % z->img_comp[i].h != 0) return stbi__err("bad H","Corrupt JPEG");
+      if (v_max % z->img_comp[i].v != 0) return stbi__err("bad V","Corrupt JPEG");
+   }
 
    // compute interleaved mcu info
    z->img_h_max = h_max;