gnu: mailutils: Fix uninitialized memory bug.

This was causing segfaults in the MH test suite when building with
glibc 2.26 on x86_64.

* gnu/packages/patches/mailutils-uninitialized-memory.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/mail.scm (mailutils)[source](patches, snippet): New
fields.
[native-inputs]: New field.

gnu/local.mk

@@ -889,6 +889,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/luminance-hdr-qt-printer.patch		\
   %D%/packages/patches/lvm2-static-link.patch			\
   %D%/packages/patches/lxsession-use-gapplication.patch         \
+  %D%/packages/patches/mailutils-uninitialized-memory.patch	\
   %D%/packages/patches/make-impure-dirs.patch			\
   %D%/packages/patches/mars-install.patch			\
   %D%/packages/patches/mars-sfml-2.3.patch			\

gnu/packages/mail.scm

@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015, 2017 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014 Ian Denhardt <ian@zenhack.net>
 ;;; Copyright © 2014 Sou Bunnbu <iyzsong@gmail.com>
@@ -129,7 +129,15 @@
                                  version ".tar.bz2"))
              (sha256
               (base32
-               "1dn71p85wlyisnwsb485sk3q5v393k3dizsa9fmimskdwjwgk3ch"))))
+               "1dn71p85wlyisnwsb485sk3q5v393k3dizsa9fmimskdwjwgk3ch"))
+             (patches
+              (search-patches "mailutils-uninitialized-memory.patch"))
+             (snippet
+              ;; For a rebuild of the Flex/Bison byproducts touched by the
+              ;; patch above.
+              '(for-each delete-file
+                         '("mh/mh_alias_lex.c"
+                           "libmailutils/cfg/parser.c")))))
     (build-system gnu-build-system)
     (arguments
      '(#:phases
@@ -182,6 +190,12 @@
        ;; TODO: Add `--with-sql'.
        #:configure-flags '("--sysconfdir=/etc")
        #:parallel-tests? #f))
+    (native-inputs
+     ;; Note: Bison and Flex needed due to
+     ;; 'mailutils-uninitialized-memory.patch'.
+     `(("bison" ,bison)
+       ("flex" ,flex)
+       ("perl" ,perl)))                           ;for 'gylwrap'
     (inputs
      `(("dejagnu" ,dejagnu)
        ("m4" ,m4)

gnu/packages/patches/mailutils-uninitialized-memory.patch

@@ -0,0 +1,87 @@
+Without this patch, the MH test suite would fail when building with
+glibc 2.26, with 'ali' segfaulting like this:
+
+  Core was generated by `/tmp/guix-build-mailutils-3.4.drv-0/mailutils-3.4/mh/.libs/ali -a ./Mail/mh_ali'.
+  Program terminated with signal SIGSEGV, Segmentation fault.
+  #0  0x00007f8eac263a14 in hash (
+      name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>, hash_num=0) at assoc.c:102
+  102	  for (i = 0; *name; name++)
+  (gdb) bt
+  #0  0x00007f8eac263a14 in hash (
+      name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>, hash_num=0) at assoc.c:102
+  #1  0x00007f8eac263e6b in assoc_find_slot (assoc=0xaa59e0, 
+      name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>, install=0x0, slot=0x7ffcddcbf2b8) at assoc.c:219
+  #2  0x00007f8eac264124 in mu_assoc_lookup (assoc=0xaa59e0, 
+      name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>, dataptr=0x7ffcddcbf2e0) at assoc.c:308
+  #3  0x00007f8eac29e8ac in mu_ident_deref (
+      name=0x72642e342e332d73 <error: Cannot access memory at address 0x72642e342e332d73>) at ident.c:98
+  #4  0x00007f8eac29f8a6 in mu_locus_point_deinit (pt=0xaa5718) at locus.c:48
+  #5  0x00007f8eac29fa1b in mu_locus_range_deinit (lr=0xaa5718) at locus.c:99
+  #6  0x00007f8eac29f9db in mu_locus_range_copy (dest=0xaa5718, 
+      src=0x622be0 <ali_yylloc>) at locus.c:89
+  #7  0x0000000000408a2a in push_source (name=0xaa74bc "mh_aliases2", fail=1)
+      at mh_alias_lex.l:170
+
+commit b330af9008e4c9168b379867b854f5900a539ad7
+Author: Sergey Poznyakoff <gray@gnu.org>
+Date:   Sat Nov 18 10:15:48 2017 +0200
+
+    Fix the use of uninitialized memory
+    
+    * mh/mh_alias_lex.l (push_source): Initialize locus range prior to copying
+    to it.
+    * libmailutils/cfg/parser.y (mu_cfg_tree_create_node): Likewise.
+    * libmu_sieve/util.c: (mu_sieve_value_create): Likewise.
+
+diff --git a/libmailutils/cfg/parser.y b/libmailutils/cfg/parser.y
+index 4503c7781..3436b8d90 100644
+--- a/libmailutils/cfg/parser.y
++++ b/libmailutils/cfg/parser.y
+@@ -1134,10 +1134,9 @@ mu_cfg_tree_create_node (struct mu_cfg_tree *tree,
+   
+   np = mu_alloc (size);
+   np->type = type;
++  mu_locus_range_init (&np->locus);
+   if (loc)
+     mu_locus_range_copy (&np->locus, loc);
+-  else
+-    memset (&np->locus, 0, sizeof np->locus);
+   p = (char*) (np + 1);
+   np->tag = p;
+   strcpy (p, tag);
+diff --git a/libmu_sieve/sieve-lex.l b/libmu_sieve/sieve-lex.l
+index fd145bfe1..f14e80194 100644
+--- a/libmu_sieve/sieve-lex.l
++++ b/libmu_sieve/sieve-lex.l
+@@ -190,6 +190,7 @@ push_source (const char *name)
+     {
+       ctx = mu_sieve_malloc (mu_sieve_machine, sizeof (*ctx));
+       ctx->trk = trk;
++      mu_locus_range_init (&ctx->incl_range);
+       mu_locus_range_copy (&ctx->incl_range, &yylloc);
+       ctx->i_node = sieve_source_inode;
+       ctx->input = input_stream;
+diff --git a/libmu_sieve/util.c b/libmu_sieve/util.c
+index 8d62a60c2..7d71b5509 100644
+--- a/libmu_sieve/util.c
++++ b/libmu_sieve/util.c
+@@ -55,6 +55,7 @@ mu_sieve_value_create (mu_sieve_machine_t mach, mu_sieve_data_type type,
+   val->locus.end.mu_line = locus->end.mu_line;
+   val->locus.end.mu_col = locus->end.mu_col;
+   
++  mu_locus_range_init (&val->locus);
+   mu_locus_range_copy (&val->locus, locus);
+   switch (type)
+     {
+diff --git a/mh/mh_alias_lex.l b/mh/mh_alias_lex.l
+index 371353ed3..b97264b38 100644
+--- a/mh/mh_alias_lex.l
++++ b/mh/mh_alias_lex.l
+@@ -167,6 +167,7 @@ push_source (const char *name, int fail)
+     {
+       ctx = mu_alloc (sizeof (*ctx));
+       ctx->trk = trk;
++      mu_locus_range_init (&ctx->incl_range);
+       mu_locus_range_copy (&ctx->incl_range, &yylloc);
+       ctx->exec_p = exec_p;
+       ctx->i_node = ali_source_inode;