File djvulibre-invalid-tiff.patch of Package djvulibre

diff --git a/tools/cjb2.cpp b/tools/cjb2.cpp
index 3da3ea8..701238d 100644
--- a/tools/cjb2.cpp
+++ b/tools/cjb2.cpp
@@ -744,6 +744,8 @@ read_tiff(CCImage &rimg, ByteStream *bs, cjb2opts &opts)
                               readproc, writeproc, seekproc,
                               closeproc, sizeproc, 
                               mapproc, unmapproc );
+  if (! tiff)
+    G_THROW("Tiff image is corrupted (cannot open)");
   // bitonal
   uint16 bps = 0, spp = 0;
   TIFFGetFieldDefaulted(tiff, TIFFTAG_BITSPERSAMPLE, &bps);