[newlib-cygwin] Use TLS buffer in ACL<->text conversion

[Corinna Vinschen <corinna at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=3b8372c1f2ce6546da1d71de2254c18482430e36

commit 3b8372c1f2ce6546da1d71de2254c18482430e36
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Thu Dec 24 00:32:54 2015 +0100

    Use TLS buffer in ACL<->text conversion
    
            * sec_acl.cc (acltotext32): Use tmp_pathbuf rather than stack buffer.
            (aclfromtext32): Ditto.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/ChangeLog  |  5 +++++
 winsup/cygwin/sec_acl.cc | 10 ++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 5f9eacf..c32519e 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,5 +1,10 @@
 2015-12-24  Corinna Vinschen  <corinna@vinschen.de>
 
+	* sec_acl.cc (acltotext32): Use tmp_pathbuf rather than stack buffer.
+	(aclfromtext32): Ditto.
+
+2015-12-24  Corinna Vinschen  <corinna@vinschen.de>
+
 	* sec_acl.cc: Cosmetic changes.
 
 2015-12-18  Corinna Vinschen  <corinna@vinschen.de>
diff --git a/winsup/cygwin/sec_acl.cc b/winsup/cygwin/sec_acl.cc
index dd75e32..348f0bc 100644
--- a/winsup/cygwin/sec_acl.cc
+++ b/winsup/cygwin/sec_acl.cc
@@ -1432,7 +1432,8 @@ acltotext32 (aclent_t *aclbufp, int aclcnt)
       set_errno (EINVAL);
       return NULL;
     }
-  char buf[32000];
+  tmp_pathbuf tp;
+  char *buf = tp.c_get ();
   buf[0] = '\0';
   bool first = true;
 
@@ -1502,16 +1503,17 @@ permfromstr (char *perm)
 extern "C" aclent_t *
 aclfromtext32 (char *acltextp, int *)
 {
-  if (!acltextp)
+  if (!acltextp || strlen (acltextp) > NT_MAX_PATH)
     {
       set_errno (EINVAL);
       return NULL;
     }
-  char buf[strlen (acltextp) + 1];
+  tmp_pathbuf tp;
   aclent_t lacl[MAX_ACL_ENTRIES];
   memset (lacl, 0, sizeof lacl);
   int pos = 0;
-  strcpy (buf, acltextp);
+  char *buf = tp.t_get ();
+  stpcpy (buf, acltextp);
   char *lasts;
   cyg_ldap cldap;
   for (char *c = strtok_r (buf, ",", &lasts);