gnu: opensmtpd: Fix crash on table authentication.

* gnu/packages/patches/opensmtpd-fix-crash.patch: New patch.
* gnu/packages/mail.scm (opensmtpd)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.

Signed-off-by: Tobias Geerinckx-Rice <me@tobias.gr>

gnu/local.mk

@@ -967,6 +967,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/openldap-CVE-2017-9287.patch		\
   %D%/packages/patches/openocd-nrf52.patch			\
   %D%/packages/patches/openscenegraph-ffmpeg3.patch             \
+  %D%/packages/patches/opensmtpd-fix-crash.patch		\
   %D%/packages/patches/openssl-runpath.patch			\
   %D%/packages/patches/openssl-1.1.0-c-rehash-in.patch		\
   %D%/packages/patches/openssl-c-rehash-in.patch		\

gnu/packages/mail.scm

@@ -1995,7 +1995,9 @@ transfer protocols.")
                                   name "-" version ".tar.gz"))
               (sha256
                (base32
-                "10bsfsnlg9d9i6l2izdnxp05s3ri8fvwzqxvx1jmarc852382619"))))
+                "10bsfsnlg9d9i6l2izdnxp05s3ri8fvwzqxvx1jmarc852382619"))
+              ;; Fixed upstream: <github.com/OpenSMTPD/OpenSMTPD/pull/835>.
+              (patches (search-patches "opensmtpd-fix-crash.patch"))))
     (build-system gnu-build-system)
     (inputs
      `(("bdb" ,bdb)

gnu/packages/patches/opensmtpd-fix-crash.patch

@@ -0,0 +1,44 @@
+From 9b5f70b93e038df5446bd37a4adac5a0380748e7 Mon Sep 17 00:00:00 2001
+From: johannes <johannes.brechtmann@gmail.com>
+Date: Wed, 21 Feb 2018 23:57:11 +0100
+Subject: [PATCH] crypt_checkpass: include HAVE_CRYPT_H definition, add NULL
+ check
+
+---
+ openbsd-compat/crypt_checkpass.c | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/openbsd-compat/crypt_checkpass.c b/openbsd-compat/crypt_checkpass.c
+index dafd2dae..d10b3a57 100644
+--- a/openbsd-compat/crypt_checkpass.c
++++ b/openbsd-compat/crypt_checkpass.c
+@@ -1,5 +1,6 @@
+ /* OPENBSD ORIGINAL: lib/libc/crypt/cryptutil.c */
+ 
++#include "includes.h"
+ #include <errno.h>
+ #ifdef HAVE_CRYPT_H
+ #include <crypt.h>
+@@ -10,6 +11,8 @@
+ int
+ crypt_checkpass(const char *pass, const char *goodhash)
+ {
++	char *c;
++
+ 	if (goodhash == NULL)
+ 		goto fail;
+ 
+@@ -17,7 +20,11 @@ crypt_checkpass(const char *pass, const char *goodhash)
+ 	if (strlen(goodhash) == 0 && strlen(pass) == 0)
+ 		return 0;
+ 
+-	if (strcmp(crypt(pass, goodhash), goodhash) == 0)
++	c = crypt(pass, goodhash);
++	if (c == NULL)
++		goto fail;
++
++	if (strcmp(c, goodhash) == 0)
+ 		return 0;
+ 
+ fail:
+