1 files changed, 19 insertions, 18 deletions

diff --git a/winsup/cygwin/dtable.cc b/winsup/cygwin/dtable.cc
index b94e9cf38..95225bb49 100644
--- a/winsup/cygwin/dtable.cc
+++ b/winsup/cygwin/dtable.cc
@@ -433,6 +433,7 @@ dtable::dup2 (int oldfd, int newfd)
 
   MALLOC_CHECK;
   debug_printf ("dup2 (%d, %d)", oldfd, newfd);
+  SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup");
 
   if (not_open (oldfd))
     {
@@ -441,6 +442,13 @@ dtable::dup2 (int oldfd, int newfd)
       goto done;
     }
 
+  if (newfd < 0)
+    {
+      syscall_printf ("new fd out of bounds: %d", newfd);
+      set_errno (EBADF);
+      goto done;
+    }
+
   if (newfd == oldfd)
     {
       res = 0;
@@ -453,35 +461,28 @@ dtable::dup2 (int oldfd, int newfd)
       goto done;
     }
 
-  debug_printf ("newfh->io_handle %p, oldfh->io_handle %p", newfh->get_io_handle (), fds[oldfd]->get_io_handle ());
-  SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup");
+  debug_printf ("newfh->io_handle %p, oldfh->io_handle %p",
+		newfh->get_io_handle (), fds[oldfd]->get_io_handle ());
 
-  if (newfd < 0)
+  if (!not_open (newfd))
+    _close (newfd);
+  else if ((size_t) newfd < size)
+    /* nothing to do */;
+  else if (find_unused_handle (newfd) < 0)
     {
-      syscall_printf ("new fd out of bounds: %d", newfd);
-      set_errno (EBADF);
+      newfh->close ();
+      res = -1;
       goto done;
     }
 
-  if ((size_t) newfd >= size)
-   {
-     int inc_size = NOFILE_INCR * ((newfd + NOFILE_INCR - 1) / NOFILE_INCR) -
-		    size;
-     extend (inc_size);
-   }
-
-  if (!not_open (newfd))
-    _close (newfd);
   fds[newfd] = newfh;
 
-  ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup");
-  MALLOC_CHECK;
-
   if ((res = newfd) <= 2)
     set_std_handle (res);
 
-  MALLOC_CHECK;
 done:
+  MALLOC_CHECK;
+  ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup");
   syscall_printf ("%d = dup2 (%d, %d)", res, oldfd, newfd);
 
   return res;