From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Thu, 5 May 2022 00:14:43 +0000 (+0200)
Subject: hurd spawni: Fix reauthenticating closed fds
X-Git-Tag: glibc-2.36~312
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eff158b75dee466ac0c37a17b2165072ee0b7aeb;p=thirdparty%2Fglibc.git

hurd spawni: Fix reauthenticating closed fds

When an fd is closed, the port cell remains, but the port becomes
MACH_PORT_NULL, so we have to guard against it.
---

diff --git a/sysdeps/mach/hurd/spawni.c b/sysdeps/mach/hurd/spawni.c
index f19b688411e..ffc62e660e3 100644
--- a/sysdeps/mach/hurd/spawni.c
+++ b/sysdeps/mach/hurd/spawni.c
@@ -154,7 +154,7 @@ __spawni (pid_t *pid, const char *file,
      reauthenticated, or was newly opened on behalf of the child.  */
   error_t reauthenticate_fd (int fd)
     {
-      if (dtable_cells[fd] != NULL)
+      if (dtable_cells[fd] != NULL && dtable[fd] != MACH_PORT_NULL)
 	{
 	  file_t newfile;
 	  mach_port_t ref = __mach_reply_port ();