bash: memleak bug fix for builtin command read

Built in command "read" with "-e" use Readline to obtain the line
in an interactive shell. In this process, a string "rlbuf" is
just allocated without free operation thus cause memory leak.

This patch had been submitted to upstream:
http://lists.gnu.org/archive/html/bug-bash/2017-02/msg00061.html

(From OE-Core rev: a2b278a6eaa9e9b48d858e3be6712267c0122598)

Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com>
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/bash/bash/bash-memleak-bug-fix-for-builtin-command-read.patch

@@ -0,0 +1,35 @@
+From d3b6303a6853f612a56848ee4e59eaa0b0ab9489 Mon Sep 17 00:00:00 2001
+From: Zhang Xiao <xiao.zhang@windriver.com>
+Date: Tue, 21 Feb 2017 11:30:14 +0800
+Subject: [PATCH] bash: memleak bug fix for builtin command read
+
+Built in command "read" with "-e" use Readline to obtain the line
+in an interactive shell. In this process, a string "rlbuf" is
+just allocated without free operation thus cause memory leak. Fix it.
+
+Upstream-Status: Submitted [http://lists.gnu.org/archive/html/bug-bash/2017-02/msg00061.html]
+
+Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com>
+---
+ builtins/read.def | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/builtins/read.def b/builtins/read.def
+index 4397154..ee0c5a6 100644
+--- a/builtins/read.def
++++ b/builtins/read.def
+@@ -674,6 +674,11 @@ add_char:
+   input_string[i] = '\0';
+   CHECK_ALRM;
+ 
++#if defined (READLINE)
++  if (edit)
++    xfree (rlbuf);
++#endif
++
+   if (retval < 0)
+     {
+       t_errno = errno;
+-- 
+1.9.1
+

meta/recipes-extended/bash/bash_4.4.bb

@@ -25,6 +25,7 @@ SRC_URI = "${GNU_MIRROR}/bash/${BP}.tar.gz;name=tarball \
            file://run-ptest \
            file://fix-run-builtins.patch \
            file://0001-help-fix-printf-format-security-warning.patch \
+           file://bash-memleak-bug-fix-for-builtin-command-read.patch \
            "
 
 SRC_URI[tarball.md5sum] = "148888a7c95ac23705559b6f477dfe25"