Use dup() to get available file descriptor when using -inetd option

Resolves: RHEL-21000

tigervnc-use-dup-to-get-available-fd-for-inetd.patch

@@ -0,0 +1,17 @@
+diff --git a/unix/xserver/hw/vnc/xvnc.c b/unix/xserver/hw/vnc/xvnc.c
+index f8141959..c5c36539 100644
+--- a/unix/xserver/hw/vnc/xvnc.c
++++ b/unix/xserver/hw/vnc/xvnc.c
+@@ -366,8 +366,10 @@ ddxProcessArgument(int argc, char *argv[], int i)
+     if (strcmp(argv[i], "-inetd") == 0) {
+         int nullfd;
+ 
+-        dup2(0, 3);
+-        vncInetdSock = 3;
++        if ((vncInetdSock = dup(0)) == -1)
++            FatalError
++                ("Xvnc error: failed to allocate a new file descriptor for -inetd: %s\n", strerror(errno));
++
+ 
+         /* Avoid xserver >= 1.19's epoll-fd becoming fd 2 / stderr only to be
+            replaced by /dev/null by OsInit() because the pollfd is not

tigervnc.spec

@@ -5,7 +5,7 @@
 
 Name:           tigervnc
 Version:        1.13.1
-Release:        5%{?dist}
+Release:        6%{?dist}
 Summary:        A TigerVNC remote display system
 
 %global _hardened_build 1
@@ -28,6 +28,7 @@ Patch3:         tigervnc-dont-install-appstream-metadata-file.patch
 
 # Upstream patches
 Patch50:        tigervnc-support-username-alias-in-plainusers.patch
+Patch51:        tigervnc-use-dup-to-get-available-fd-for-inetd.patch
 
 # This is tigervnc-%%{version}/unix/xserver116.patch rebased on the latest xorg
 Patch100:       tigervnc-xserver120.patch
@@ -190,6 +191,7 @@ popd
 
 # Upstream patches
 %patch50 -p1 -b .support-username-alias-in-plainusers
+%patch51 -p1 -b .use-dup-to-get-available-fd-for-inetd
 
 %build
 %ifarch sparcv9 sparc64 s390 s390x
@@ -344,6 +346,10 @@ fi
 %ghost %verify(not md5 size mode mtime) %{_sharedstatedir}/selinux/%{selinuxtype}/active/modules/200/%{modulename}
 
 %changelog
+* Mon Jan 08 2024 Jan Grulich <jgrulich@redhat.com> - 1.13.1-6
+- Use dup() to get available file descriptor when using -inetd option
+  Resolves: RHEL-21000
+
 * Mon Dec 18 2023 Jan Grulich <jgrulich@redhat.com> - 1.13.1-5
 - Fix CVE-2023-6377 tigervnc: xorg-x11-server: out-of-bounds memory reads/writes in XKB button actions
   Resolves: RHEL-18410