gnu: osip: Fix CVE-2017-7853.

* gnu/packages/patches/osip-CVE-2017-7853.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/telephony.scm (osip)[source]: Use it.

gnu/local.mk

@@ -876,6 +876,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/openssl-1.1.0-c-rehash-in.patch		\
   %D%/packages/patches/openssl-c-rehash-in.patch		\
   %D%/packages/patches/orpheus-cast-errors-and-includes.patch	\
+  %D%/packages/patches/osip-CVE-2017-7853.patch			\
   %D%/packages/patches/ots-no-include-missing-file.patch	\
   %D%/packages/patches/p7zip-CVE-2016-9296.patch			\
   %D%/packages/patches/p7zip-remove-unused-code.patch		\

gnu/packages/patches/osip-CVE-2017-7853.patch

@@ -0,0 +1,40 @@
+Fix CVE-2017-7853:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7853
+https://savannah.gnu.org/support/index.php?109265
+
+Patch copied from upstream source repository:
+
+https://git.savannah.gnu.org/cgit/osip.git/commit/?id=1ae06daf3b2375c34af23083394a6f010be24a45
+
+From 1ae06daf3b2375c34af23083394a6f010be24a45 Mon Sep 17 00:00:00 2001
+From: Aymeric Moizard <amoizard@gmail.com>
+Date: Tue, 21 Feb 2017 17:16:26 +0100
+Subject: [PATCH]  * fix bug report: sr #109265: SIP message body length
+ underflow in libosip2-4.1.0    https://savannah.gnu.org/support/?109265   
+ also applicable to current latest version
+
+---
+ src/osipparser2/osip_message_parse.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/src/osipparser2/osip_message_parse.c b/src/osipparser2/osip_message_parse.c
+index 1628c60..aa35446 100644
+--- a/src/osipparser2/osip_message_parse.c
++++ b/src/osipparser2/osip_message_parse.c
+@@ -784,6 +784,12 @@ msg_osip_body_parse (osip_message_t * sip, const char *start_of_buf, const char
+     if ('\n' == start_of_body[0] || '\r' == start_of_body[0])
+       start_of_body++;
+ 
++    /* if message body is empty or contains a single CR/LF */
++    if (end_of_body <= start_of_body) {
++      osip_free (sep_boundary);
++      return OSIP_SYNTAXERROR;
++    }
++
+     body_len = end_of_body - start_of_body;
+ 
+     /* Skip CR before end boundary. */
+-- 
+2.13.1
+

gnu/packages/telephony.scm

@@ -124,6 +124,7 @@ packet-manipulation library.")
    (source (origin
             (method url-fetch)
             (uri (string-append "mirror://gnu/osip/libosip2-" version ".tar.gz"))
+            (patches (search-patches "osip-CVE-2017-7853.patch"))
             (sha256
              (base32
               "00yznbrm9q04wgd4b831km8iwlvwvsnwv87igf79g5vj9yakr88q"))))