gnu: poppler: Fix CVE-2015-8868.

* gnu/packages/pdf.scm (poppler)[replacement]: New field.
(poppler/fixed): New variable.
* gnu/packages/patches/poppler-CVE-2015-8868.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -681,6 +681,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/plink-1.07-unclobber-i.patch		\
   gnu/packages/patches/plotutils-libpng-jmpbuf.patch		\
   gnu/packages/patches/polkit-drop-test.patch			\
+  gnu/packages/patches/poppler-CVE-2015-8868.patch		\
   gnu/packages/patches/portaudio-audacity-compat.patch		\
   gnu/packages/patches/procmail-ambiguous-getline-debian.patch  \
   gnu/packages/patches/pt-scotch-build-parallelism.patch	\

gnu/packages/patches/poppler-CVE-2015-8868.patch

@@ -0,0 +1,30 @@
+Fixes CVE-2015-8868 (heap overflow).
+
+Upstream source:
+https://cgit.freedesktop.org/poppler/poppler/commit/?id=b3425dd3261679958cd56c0f71995c15d2124433
+
+From b3425dd3261679958cd56c0f71995c15d2124433 Mon Sep 17 00:00:00 2001
+From: Albert Astals Cid <aacid@kde.org>
+Date: Tue, 22 Dec 2015 22:50:33 +0100
+Subject: Do not crash on invalid files
+
+Bug #93476
+
+diff --git a/poppler/Function.cc b/poppler/Function.cc
+index 67283df..ee5afc1 100644
+--- a/poppler/Function.cc
++++ b/poppler/Function.cc
+@@ -577,6 +577,10 @@ ExponentialFunction::ExponentialFunction(Object *funcObj, Dict *dict) {
+       goto err2;
+     }
+     n = obj1.arrayGetLength();
++    if (unlikely(n > funcMaxOutputs)) {
++      error(errSyntaxError, -1, "Function's C0 array is wrong length");
++      n = funcMaxOutputs;
++    }
+     for (i = 0; i < n; ++i) {
+       obj1.arrayGet(i, &obj2);
+       if (!obj2.isNum()) {
+-- 
+cgit v0.10.2
+

gnu/packages/pdf.scm

@@ -53,6 +53,7 @@ (define-public poppler
   (package
    (name "poppler")
    (version "0.37.0")
+   (replacement poppler/fixed)
    (source (origin
             (method url-fetch)
             (uri (string-append "https://poppler.freedesktop.org/poppler-"
@@ -104,6 +105,13 @@ (define-public poppler
    (license license:gpl2+)
    (home-page "http://poppler.freedesktop.org/")))
 
+(define poppler/fixed
+  (package
+    (inherit poppler)
+    (source (origin
+              (inherit (package-source poppler))
+              (patches (search-patches "poppler-CVE-2015-8868.patch"))))))
+
 (define-public poppler-qt4
   (package (inherit poppler)
    (name "poppler-qt4")