From 00626c3830b869259098985afa38933d77ccec72 Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Sat, 2 Mar 2013 09:40:22 -0800
Subject: [PATCH] unvalidated index in _XkbReadKeyActions() [CVE-2013-1997
 6/15]

If the X server returns key action indexes outside the range of the number
of keys it told us to allocate, out of bounds memory access could occur.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Matthieu Herrb <matthieu.herrb@laas.fr>
---
 src/xkb/XKBGetMap.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/xkb/XKBGetMap.c b/src/xkb/XKBGetMap.c
index 4a428d3a..86ecf9db 100644
--- a/src/xkb/XKBGetMap.c
+++ b/src/xkb/XKBGetMap.c
@@ -269,6 +269,10 @@ Status		ret = Success;
 	symMap = &info->map->key_sym_map[rep->firstKeyAct];
 	for (i=0;i<(int)rep->nKeyActs;i++,symMap++) {
 	    if (numDesc[i]==0) {
+		if ((i + rep->firstKeyAct) > (info->max_key_code + 1)) {
+		    ret = BadLength;
+		    goto done;
+		}
 		info->server->key_acts[i+rep->firstKeyAct]= 0;
 	    }
 	    else {