gnu: libextractor: Fix CVE-2018-{20430,20431}.

* gnu/packages/patches/libextractor-CVE-2018-20430.patch,
gnu/packages/patches/libextractor-CVE-2018-20431.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/gnunet.scm (libextractor)[source]: Use them.

gnu/local.mk

@@ -889,6 +889,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/libevent-2.1-skip-failing-test.patch	\
   %D%/packages/patches/libexif-CVE-2016-6328.patch		\
   %D%/packages/patches/libexif-CVE-2017-7544.patch		\
+  %D%/packages/patches/libextractor-CVE-2018-20430.patch	\
+  %D%/packages/patches/libextractor-CVE-2018-20431.patch	\
   %D%/packages/patches/libgcrypt-make-yat2m-reproducible.patch	\
   %D%/packages/patches/libgit2-mtime-0.patch			\
   %D%/packages/patches/libgit2-oom-test.patch			\

gnu/packages/gnunet.scm

@@ -73,6 +73,8 @@
             (method url-fetch)
             (uri (string-append "mirror://gnu/libextractor/libextractor-"
                                 version ".tar.gz"))
+            (patches (search-patches "libextractor-CVE-2018-20430.patch"
+                                     "libextractor-CVE-2018-20431.patch"))
             (sha256
              (base32
               "1z1cb35griqzvshqdv5ck98dy0sgpsswn7fgiy7lbzi34sma8dg2"))))

gnu/packages/patches/libextractor-CVE-2018-20430.patch

@@ -0,0 +1,60 @@
+Fix CVE-2018-20430:
+
+https://gnunet.org/bugs/view.php?id=5493
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20430
+https://security-tracker.debian.org/tracker/CVE-2018-20430
+
+Patch copied from upstream source repository:
+
+https://gnunet.org/git/libextractor.git/commit/?id=b405d707b36e0654900cba78e89f49779efea110
+
+From b405d707b36e0654900cba78e89f49779efea110 Mon Sep 17 00:00:00 2001
+From: Christian Grothoff <christian@grothoff.org>
+Date: Thu, 20 Dec 2018 22:47:53 +0100
+Subject: [PATCH] fix #5493 (out of bounds read)
+
+---
+ src/common/convert.c | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/src/common/convert.c b/src/common/convert.c
+index c0edf21..2be2108 100644
+--- a/src/common/convert.c
++++ b/src/common/convert.c
+@@ -36,8 +36,8 @@
+  *  string is returned.
+  */
+ char *
+-EXTRACTOR_common_convert_to_utf8 (const char *input, 
+-				  size_t len, 
++EXTRACTOR_common_convert_to_utf8 (const char *input,
++				  size_t len,
+ 				  const char *charset)
+ {
+ #if HAVE_ICONV
+@@ -52,7 +52,7 @@ EXTRACTOR_common_convert_to_utf8 (const char *input,
+   i = input;
+   cd = iconv_open ("UTF-8", charset);
+   if (cd == (iconv_t) - 1)
+-    return strdup (i);
++    return strndup (i, len);
+   if (len > 1024 * 1024)
+     {
+       iconv_close (cd);
+@@ -67,11 +67,11 @@ EXTRACTOR_common_convert_to_utf8 (const char *input,
+     }
+   itmp = tmp;
+   finSize = tmpSize;
+-  if (iconv (cd, (char **) &input, &len, &itmp, &finSize) == SIZE_MAX)
++  if (iconv (cd, (char **) &input, &len, &itmp, &finSize) == ((size_t) -1))
+     {
+       iconv_close (cd);
+       free (tmp);
+-      return strdup (i);
++      return strndup (i, len);
+     }
+   ret = malloc (tmpSize - finSize + 1);
+   if (ret == NULL)
+-- 
+2.20.1
+

gnu/packages/patches/libextractor-CVE-2018-20431.patch

@@ -0,0 +1,53 @@
+Fix CVE-2018-20431:
+
+https://gnunet.org/bugs/view.php?id=5494
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20431
+https://security-tracker.debian.org/tracker/CVE-2018-20431
+
+Patch copied from upstream source repository:
+
+https://gnunet.org/git/libextractor.git/commit/?id=489c4a540bb2c4744471441425b8932b97a153e7
+
+To apply the patch to libextractor 1.8 release tarball,
+hunk #1 which patches ChangeLog is removed. 
+
+From 489c4a540bb2c4744471441425b8932b97a153e7 Mon Sep 17 00:00:00 2001
+From: Christian Grothoff <christian@grothoff.org>
+Date: Thu, 20 Dec 2018 23:02:28 +0100
+Subject: [PATCH] fix #5494
+
+---
+ ChangeLog                    | 3 ++-
+ src/plugins/ole2_extractor.c | 9 +++++++--
+ 2 files changed, 9 insertions(+), 3 deletions(-)
+
+diff --git a/src/plugins/ole2_extractor.c b/src/plugins/ole2_extractor.c
+index 53fa1b9..a48b726 100644
+--- a/src/plugins/ole2_extractor.c
++++ b/src/plugins/ole2_extractor.c
+@@ -173,7 +173,7 @@ struct ProcContext
+   EXTRACTOR_MetaDataProcessor proc;
+ 
+   /**
+-   * Closure for 'proc'.
++   * Closure for @e proc.
+    */
+   void *proc_cls;
+ 
+@@ -213,7 +213,12 @@ process_metadata (gpointer key,
+ 
+   if (G_VALUE_TYPE(gval) == G_TYPE_STRING)
+     {
+-      contents = strdup (g_value_get_string (gval));
++      const char *gvals;
++
++      gvals = g_value_get_string (gval);
++      if (NULL == gvals)
++        return;
++      contents = strdup (gvals);
+     }
+   else
+     {
+-- 
+2.20.1
+