gnu: perl-dbd-mysql: Fix CVE-2017-10788.

* gnu/packages/patches/perl-dbd-mysql-CVE-2017-10788.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/databases.scm (perl-dbd-mysql)[source]: Use it.

gnu/local.mk

@@ -904,6 +904,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/pcre2-CVE-2017-8786.patch		\
   %D%/packages/patches/perl-file-path-CVE-2017-6512.patch	\
   %D%/packages/patches/perl-autosplit-default-time.patch	\
+  %D%/packages/patches/perl-dbd-mysql-CVE-2017-10788.patch	\
   %D%/packages/patches/perl-deterministic-ordering.patch	\
   %D%/packages/patches/perl-finance-quote-unuse-mozilla-ca.patch \
   %D%/packages/patches/perl-gd-options-passthrough-and-fontconfig.patch \

gnu/packages/databases.scm

@@ -1015,7 +1015,8 @@ columns, primary keys, unique constraints and relationships.")
                            "DBD-mysql-" version ".tar.gz"))
        (sha256
         (base32
-         "16bg7l28n65ngi1abjxvwk906a80i2vd5vzjn812dx8phdg8d7v2"))))
+         "16bg7l28n65ngi1abjxvwk906a80i2vd5vzjn812dx8phdg8d7v2"))
+       (patches (search-patches "perl-dbd-mysql-CVE-2017-10788.patch"))))
     (build-system perl-build-system)
     ;; Tests require running MySQL server
     (arguments `(#:tests? #f))

gnu/packages/patches/perl-dbd-mysql-CVE-2017-10788.patch

@@ -0,0 +1,62 @@
+Fix CVE-2017-10788:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-10788
+
+Patch written to match corrected documentation specifications:
+
+Old: http://web.archive.org/web/20161220021610/https://dev.mysql.com/doc/refman/5.7/en/mysql-stmt-close.html
+New: https://dev.mysql.com/doc/refman/5.7/en/mysql-stmt-close.html
+
+The patch itself is from https://github.com/perl5-dbi/DBD-mysql/issues/120#issuecomment-312420660.
+
+From 9ce10cfae7138c37c3a0cb2ba2a1d682482943d0 Mon Sep 17 00:00:00 2001
+From: Pali <pali@cpan.org>
+Date: Sun, 25 Jun 2017 10:07:39 +0200
+Subject: [PATCH] Fix use-after-free after calling mysql_stmt_close()
+
+Ignore return value from mysql_stmt_close() and also its error message
+because it points to freed memory after mysql_stmt_close() was called.
+---
+ dbdimp.c |    8 ++------
+ mysql.xs |    7 ++-----
+ 2 files changed, 4 insertions(+), 11 deletions(-)
+
+diff --git a/dbdimp.c b/dbdimp.c
+index c60a5f6..a6410e5 100644
+--- a/dbdimp.c
++++ b/dbdimp.c
+@@ -4894,12 +4894,8 @@ void dbd_st_destroy(SV *sth, imp_sth_t *imp_sth) {
+
+   if (imp_sth->stmt)
+   {
+-    if (mysql_stmt_close(imp_sth->stmt))
+-    {
+-      do_error(DBIc_PARENT_H(imp_sth), mysql_stmt_errno(imp_sth->stmt),
+-          mysql_stmt_error(imp_sth->stmt),
+-          mysql_stmt_sqlstate(imp_sth->stmt));
+-    }
++    mysql_stmt_close(imp_sth->stmt);
++    imp_sth->stmt= NULL;
+   }
+ #endif
+
+diff --git a/mysql.xs b/mysql.xs
+index 55376e1..affde59 100644
+--- a/mysql.xs
++++ b/mysql.xs
+@@ -434,11 +434,8 @@ do(dbh, statement, attr=Nullsv, ...)
+       if (bind)
+         Safefree(bind);
+
+-      if(mysql_stmt_close(stmt))
+-      {
+-        fprintf(stderr, "\n failed while closing the statement");
+-        fprintf(stderr, "\n %s", mysql_stmt_error(stmt));
+-      }
++      mysql_stmt_close(stmt);
++      stmt= NULL;
+
+       if (retval == -2) /* -2 means error */
+       {
+--
+1.7.9.5