gnu: libssh: Update to 0.7.5.

* gnu/packages/ssh.scm (libssh): Update to 0.7.5.
[source](patches): New field.

gnu/local.mk

@@ -743,6 +743,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/libsndfile-armhf-type-checks.patch	\
   %D%/packages/patches/libsndfile-CVE-2017-8361-8363-8365.patch	\
   %D%/packages/patches/libsndfile-CVE-2017-8362.patch		\
+  %D%/packages/patches/libssh-hostname-parser-bug.patch		\
   %D%/packages/patches/libssh2-fix-build-failure-with-gcrypt.patch	\
   %D%/packages/patches/libtar-CVE-2013-4420.patch 		\
   %D%/packages/patches/libtasn1-CVE-2017-6891.patch 		\

gnu/packages/patches/libssh-hostname-parser-bug.patch

@@ -0,0 +1,31 @@
+Fix "Hostname" parsing in OpenSSH config files, as reported
+at <https://red.libssh.org/issues/260>.
+
+From: Niels Ole Salscheider <niels_ole@salscheider-online.de>
+Date: Mon, 8 May 2017 17:36:13 +0200
+Subject: [PATCH] Fix reading of the first parameter
+
+This is a fixup for 7b8b5eb4eac314a3a29be812bef0264c6611f6e7.
+Previously, it would return as long as the parameter was _not_ seen
+before. It also did not handle the case for the unsupported opcode (-1)
+which would cause a segfault when accessing the "seen" array.
+---
+ src/config.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/src/config.c b/src/config.c
+index 7c03b27..238a655 100644
+--- a/src/config.c
++++ b/src/config.c
+@@ -218,8 +218,9 @@ static int ssh_config_parse_line(ssh_session session, const char *line,
+   }
+ 
+   opcode = ssh_config_get_opcode(keyword);
+-  if (*parsing == 1 && opcode != SOC_HOST) {
+-      if (seen[opcode] == 0) {
++  if (*parsing == 1 && opcode != SOC_HOST &&
++      opcode > SOC_UNSUPPORTED && opcode < SOC_END) {
++      if (seen[opcode] == 1) {
+           return 0;
+       }
+       seen[opcode] = 1;

gnu/packages/ssh.scm

@@ -58,15 +58,16 @@
 (define-public libssh
   (package
     (name "libssh")
-    (version "0.7.4")
+    (version "0.7.5")
     (source (origin
               (method url-fetch)
               (uri (string-append
-                    "https://red.libssh.org/attachments/download/210/libssh-"
+                    "https://red.libssh.org/attachments/download/218/libssh-"
                     version ".tar.xz"))
               (sha256
                (base32
-                "03bcp9ksqp0s1pmwfmzhcknvkxay5k0mjzzxp3rjlifbng1vxq9r"))))
+                "15bh6dm9c50ndddzh3gqcgw7axp3ghrspjpkb1z3dr90vkanvs2l"))
+              (patches (search-patches "libssh-hostname-parser-bug.patch"))))
     (build-system cmake-build-system)
     (outputs '("out" "debug"))
     (arguments