[PATCH 1/1] gnu: vim: Fix CVE-2017-5953.

[Leo Famulari <leo@famulari.name>]

* gnu/packages/patches/vim-CVE-2017-5953.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/vim.scm (vim)[source]: Use it.
---
 gnu/local.mk                                 |  1 +
 gnu/packages/patches/vim-CVE-2017-5953.patch | 36 ++++++++++++++++++++++++++++
 gnu/packages/vim.scm                         |  1 +
 3 files changed, 38 insertions(+)
 create mode 100644 gnu/packages/patches/vim-CVE-2017-5953.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index 0e8d90110..8e5555a1a 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -951,6 +951,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/util-linux-tests.patch			\
   %D%/packages/patches/upower-builddir.patch			\
   %D%/packages/patches/valgrind-enable-arm.patch		\
+  %D%/packages/patches/vim-CVE-2017-5953.patch			\
   %D%/packages/patches/vorbis-tools-CVE-2014-9638+CVE-2014-9639.patch		\
   %D%/packages/patches/vorbis-tools-CVE-2014-9640.patch		\
   %D%/packages/patches/vorbis-tools-CVE-2015-6749.patch		\
diff --git a/gnu/packages/patches/vim-CVE-2017-5953.patch b/gnu/packages/patches/vim-CVE-2017-5953.patch
new file mode 100644
index 000000000..69f93d9af
--- /dev/null
+++ b/gnu/packages/patches/vim-CVE-2017-5953.patch
@@ -0,0 +1,36 @@
+Fix CVE-2017-5953:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5953
+https://groups.google.com/forum/#!topic/vim_dev/t-3RSdEnrHY
+
+Patch adapted from upstream source repository:
+
+https://github.com/vim/vim/commit/399c297aa93afe2c0a39e2a1b3f972aebba44c9d
+
+From 399c297aa93afe2c0a39e2a1b3f972aebba44c9d Mon Sep 17 00:00:00 2001
+From: Bram Moolenaar <Bram@vim.org>
+Date: Thu, 9 Feb 2017 21:07:12 +0100
+Subject: [PATCH] patch 8.0.0322: possible overflow with corrupted spell file
+
+Problem:    Possible overflow with spell file where the tree length is
+            corrupted.
+Solution:   Check for an invalid length (suggested by shqking)
+---
+ src/spellfile.c | 3 +++
+ src/version.c   | 2 ++
+ 2 files changed, 5 insertions(+)
+
+diff --git a/src/spellfile.c b/src/spellfile.c
+index c7d87c6..8b1a3a6 100644
+--- a/src/spellfile.c
++++ b/src/spellfile.c
+@@ -1595,6 +1595,9 @@ spell_read_tree(
+     len = get4c(fd);
+     if (len < 0)
+ 	return SP_TRUNCERROR;
++    if (len >= 0x3ffffff)
++	/* Invalid length, multiply with sizeof(int) would overflow. */
++	return SP_FORMERROR;
+     if (len > 0)
+     {
+ 	/* Allocate the byte array. */
diff --git a/gnu/packages/vim.scm b/gnu/packages/vim.scm
index f042aba93..cdb32ac7e 100644
--- a/gnu/packages/vim.scm
+++ b/gnu/packages/vim.scm
@@ -63,6 +63,7 @@
              (uri (string-append "https://github.com/vim/vim/archive/v"
                                  version ".tar.gz"))
              (file-name (string-append name "-" version ".tar.gz"))
+             (patches (search-patches "vim-CVE-2017-5953.patch"))
              (sha256
               (base32
                "04samk2bakyixbxyc3p0g6ypls45105sikibg0wc6lmak9bqjs85"))))
-- 
2.11.1