diff --git a/libdjvu/IW44Image.cpp b/libdjvu/IW44Image.cpp
index e8d4b44..aa3d554 100644
--- a/libdjvu/IW44Image.cpp
+++ b/libdjvu/IW44Image.cpp
@@ -678,7 +678,11 @@ IW44Image::Map::image(signed char *img8, int rowsize, int pixsep, int fast)
   size_t sz = bw * bh;
   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");
   // Copy coefficients
   int i;
   short *p = data16;