[bug#29793] [PATCH] gnu: libarchive: Fix CVE-2017-14502.

[Leo Famulari <leo@famulari.name>]

* gnu/packages/patches/libarchive-CVE-2017-14502.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/backup.scm (libarchive-3.3.2)[source]: Use it.
---
 gnu/local.mk                                       |  1 +
 gnu/packages/backup.scm                            |  3 +-
 .../patches/libarchive-CVE-2017-14502.patch        | 40 ++++++++++++++++++++++
 3 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/libarchive-CVE-2017-14502.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index efb91fd82..d5cd0b339 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -791,6 +791,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/liba52-set-soname.patch			\
   %D%/packages/patches/liba52-use-mtune-not-mcpu.patch		\
   %D%/packages/patches/libarchive-CVE-2017-14166.patch		\
+  %D%/packages/patches/libarchive-CVE-2017-14502.patch		\
   %D%/packages/patches/libbase-fix-includes.patch		\
   %D%/packages/patches/libbase-use-own-logging.patch		\
   %D%/packages/patches/libbonobo-activation-test-race.patch	\
diff --git a/gnu/packages/backup.scm b/gnu/packages/backup.scm
index e634d6ab9..fab71d055 100644
--- a/gnu/packages/backup.scm
+++ b/gnu/packages/backup.scm
@@ -253,7 +253,8 @@ random access nor for in-place modification.")
        (method url-fetch)
        (uri (string-append "http://libarchive.org/downloads/libarchive-"
                            version ".tar.gz"))
-       (patches (search-patches "libarchive-CVE-2017-14166.patch"))
+       (patches (search-patches "libarchive-CVE-2017-14166.patch"
+                                "libarchive-CVE-2017-14502.patch"))
        (sha256
         (base32
          "1km0mzfl6in7l5vz9kl09a88ajx562rw93ng9h2jqavrailvsbgd"))))))
diff --git a/gnu/packages/patches/libarchive-CVE-2017-14502.patch b/gnu/packages/patches/libarchive-CVE-2017-14502.patch
new file mode 100644
index 000000000..8e0508afb
--- /dev/null
+++ b/gnu/packages/patches/libarchive-CVE-2017-14502.patch
@@ -0,0 +1,40 @@
+Fix CVE-2017-14502:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14502
+https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=573
+
+Patch copied from upstream source repository:
+
+https://github.com/libarchive/libarchive/commit/5562545b5562f6d12a4ef991fae158bf4ccf92b6
+
+From 5562545b5562f6d12a4ef991fae158bf4ccf92b6 Mon Sep 17 00:00:00 2001
+From: Joerg Sonnenberger <joerg@bec.de>
+Date: Sat, 9 Sep 2017 17:47:32 +0200
+Subject: [PATCH] Avoid a read off-by-one error for UTF16 names in RAR
+ archives.
+
+Reported-By: OSS-Fuzz issue 573
+---
+ libarchive/archive_read_support_format_rar.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/libarchive/archive_read_support_format_rar.c b/libarchive/archive_read_support_format_rar.c
+index cbb14c32..751de697 100644
+--- a/libarchive/archive_read_support_format_rar.c
++++ b/libarchive/archive_read_support_format_rar.c
+@@ -1496,7 +1496,11 @@ read_header(struct archive_read *a, struct archive_entry *entry,
+         return (ARCHIVE_FATAL);
+       }
+       filename[filename_size++] = '\0';
+-      filename[filename_size++] = '\0';
++      /*
++       * Do not increment filename_size here as the computations below
++       * add the space for the terminating NUL explicitly.
++       */
++      filename[filename_size] = '\0';
+ 
+       /* Decoded unicode form is UTF-16BE, so we have to update a string
+        * conversion object for it. */
+-- 
+2.15.1
+
-- 
2.15.1