From 1d11822601fd24a396b354fa616b04ed3df8b4ef Mon Sep 17 00:00:00 2001
From: "Thomas E. Dickey" <dickey@invisible-island.net>
Date: Tue, 4 Oct 2022 18:26:17 -0400
Subject: [PATCH] fix a memory leak in XRegisterIMInstantiateCallback

Upstream-Status: Backport [https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/1d11822601fd24a396b354fa616b04ed3df8b4ef]
CVE: CVE-2022-3554
Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>

fix a memory leak in XRegisterIMInstantiateCallback

Analysis:

    _XimRegisterIMInstantiateCallback() opens an XIM and closes it using
    the internal function pointers, but the internal close function does
    not free the pointer to the XIM (this would be done in XCloseIM()).

Report/patch:

    Date: Mon, 03 Oct 2022 18:47:32 +0800
    From: Po Lu <luangruo@yahoo.com>
    To: xorg-devel@lists.x.org
    Subject: Re: Yet another leak in Xlib

    For reference, here's how I'm calling XRegisterIMInstantiateCallback:

    XSetLocaleModifiers ("");
    XRegisterIMInstantiateCallback (compositor.display,
                                    XrmGetDatabase (compositor.display),
                                    (char *) compositor.resource_name,
                                    (char *) compositor.app_name,
                                    IMInstantiateCallback, NULL);
    and XMODIFIERS is:

        @im=ibus

Signed-off-by: Thomas E. Dickey's avatarThomas E. Dickey <dickey@invisible-island.net>
---
 modules/im/ximcp/imInsClbk.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/im/ximcp/imInsClbk.c b/modules/im/ximcp/imInsClbk.c
index 95b379c..c10e347 100644
--- a/modules/im/ximcp/imInsClbk.c
+++ b/modules/im/ximcp/imInsClbk.c
@@ -212,6 +212,9 @@ _XimRegisterIMInstantiateCallback(
     if( xim ) {
 	lock = True;
 	xim->methods->close( (XIM)xim );
+	/* XIMs must be freed manually after being opened; close just
+	   does the protocol to deinitialize the IM.  */
+	XFree( xim );
 	lock = False;
 	icb->call = True;
 	callback( display, client_data, NULL );
-- 
2.25.1

