[newlib-cygwin] Fix potential memory leak in argz_replace

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=ca632c90157aaa0f0e00843bf8501c6831abe84b

commit ca632c90157aaa0f0e00843bf8501c6831abe84b
Author: David Stacey <drstacey@tiscali.co.uk>
Date:   Wed May 27 12:08:29 2015 +0200

    Fix potential memory leak in argz_replace
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 newlib/ChangeLog                | 4 ++++
 newlib/libc/argz/argz_replace.c | 5 ++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index a70fefe..d1b0afe 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,7 @@
+2015-05-27  David Stacey  <drstacey@tiscali.co.uk>
+
+	* libc/argz/argz_replace.c: Fix potential memory leak.
+
 2015-05-26  DJ Delorie  <dj@redhat.com>
 
 	* libm/math/e_sqrt.c (__ieee754_sqrt): Don't truncate constant to
diff --git a/newlib/libc/argz/argz_replace.c b/newlib/libc/argz/argz_replace.c
index cb01eae..6bfd04b 100644
--- a/newlib/libc/argz/argz_replace.c
+++ b/newlib/libc/argz/argz_replace.c
@@ -71,7 +71,10 @@ _DEFUN (argz_replace, (argz, argz_len, str, with, replace_count),
 
       /* reallocate argz, and copy over the new value. */
       if(!(*argz = (char *)realloc(*argz, new_argz_len)))
-        return ENOMEM;
+        {
+          free(new_argz);
+          return ENOMEM;
+        }
 
       memcpy(*argz, new_argz, new_argz_len);
       *argz_len = new_argz_len;