!41 Fix CVE-2021-46310,CVE-2021-46312

From: @wk333 
Reviewed-by: @wang--ge 
Signed-off-by: @wang--ge

CVE-2021-46310.patch

@@ -0,0 +1,19 @@
+Origin: https://sourceforge.net/p/djvu/bugs/345/
+
+Index: djvulibre-3.5.28/libdjvu/IW44Image.cpp
+===================================================================
+--- djvulibre-3.5.28.orig/libdjvu/IW44Image.cpp
++++ djvulibre-3.5.28/libdjvu/IW44Image.cpp
+@@ -676,10 +676,10 @@ 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");

CVE-2021-46312.patch

@@ -0,0 +1,20 @@
+Origin: https://sourceforge.net/p/djvu/bugs/344/
+
+Index: djvulibre-3.5.28/libdjvu/IW44EncodeCodec.cpp
+===================================================================
+--- djvulibre-3.5.28.orig/libdjvu/IW44EncodeCodec.cpp
++++ djvulibre-3.5.28/libdjvu/IW44EncodeCodec.cpp
+@@ -1424,7 +1424,12 @@ IWBitmap::Encode::init(const GBitmap &bm
+   int h = bm.rows();
+   int g = bm.get_grays()-1;
+   signed char *buffer;
+-  GPBuffer<signed char> gbuffer(buffer,w*h);
++  size_t sz = w * h;
++  if (sz == 0 || g <= 0) // w or h is zero or g is not positive
++    G_THROW("IWBitmap: zero size image (corrupted file?)");
++  if (sz / (size_t)w != (size_t)h) // multiplication overflow
++    G_THROW("IWBitmap: image size exceeds maximum (corrupted file?)");
++  GPBuffer<signed char> gbuffer(buffer,sz);
+   // Prepare gray level conversion table
+   signed char  bconv[256];
+   for (i=0; i<256; i++)

djvulibre.spec

@@ -1,7 +1,7 @@
 Name:             djvulibre
 Summary:          An open source (GPL'ed) implementation of DjVu
 Version:          3.5.27
-Release:          18
+Release:          19
 License:          GPLv2+
 URL:              http://djvu.sourceforge.net/
 Source0:          http://downloads.sourceforge.net/djvu/djvulibre-%{version}.tar.gz
@@ -18,6 +18,8 @@ Patch9:           CVE-2021-32492.patch
 Patch10:          CVE-2021-32493.patch
 Patch11:          CVE-2021-3500.patch
 Patch12:          CVE-2021-3630.patch
+Patch13:          CVE-2021-46310.patch
+Patch14:          CVE-2021-46312.patch
 
 Requires(post):   xdg-utils
 Requires(preun):  xdg-utils
@@ -101,6 +103,9 @@ rm -f %{_datadir}/icons/hicolor/32x32/apps/djvulibre-djview3.png || :
 %{_mandir}/man1/*
 
 %changelog
+* Wed Sep 13 2023 wangkai <13474090681@163.com> - 3.5.27-19
+- Fix CVE-2021-46310,CVE-2021-46312
+
 * Wed Jul 07 2021 wangyue<wangyue92@huawei.com> - 3.5.27-18
 - Fix CVE-2021-3630