File djvulibre-CVE-2021-46310.patch of Package djvulibre.30376

Index: djvulibre-3.5.27/libdjvu/IW44Image.cpp
===================================================================
--- djvulibre-3.5.27.orig/libdjvu/IW44Image.cpp
+++ djvulibre-3.5.27/libdjvu/IW44Image.cpp
@@ -685,10 +685,10 @@ IW44Image::Map::image(signed char *img8,
   // Allocate reconstruction buffer
   short *data16;
   size_t sz = bw * bh;
+  if (sz == 0) // bw or bh is zero
+    G_THROW("IW44Image: zero size image (corrupted file?)");
   if (sz / (size_t)bw != (size_t)bh) // multiplication overflow
     G_THROW("IW44Image: image size exceeds maximum (corrupted file?)");
-  if (sz == 0)
-    G_THROW("IW44Image: zero size image (corrupted file?)");
   GPBuffer<short> gdata16(data16,sz);
   if (data16 == NULL)
     G_THROW("IW44Image: unable to allocate image data");