[Xen-changelog] [xen-4.2-testing] tmem: check the pool_id is valid when destroying a tmem pool

[Xen patchbot-4.2-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1348567968 -7200
# Node ID da0fd47f59b4bb479bd550dc2abd8c04bf3e0317
# Parent  d188a7ad6c75b8b9ff4ec7335176ec87a047ca28
tmem: check the pool_id is valid when destroying a tmem pool

This is part of XSA-15 / CVE-2012-3497.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
xen-unstable changeset: 25852:d189d99ef00c
xen-unstable date: Tue Sep 11 12:06:54 UTC 2012
---


diff -r d188a7ad6c75 -r da0fd47f59b4 xen/common/tmem.c
--- a/xen/common/tmem.c Tue Sep 25 12:12:04 2012 +0200
+++ b/xen/common/tmem.c Tue Sep 25 12:12:48 2012 +0200
@@ -1870,6 +1870,8 @@ static NOINLINE int do_tmem_destroy_pool
 
     if ( client->pools == NULL )
         return 0;
+    if ( pool_id >= MAX_POOLS_PER_DOMAIN )
+        return 0;
     if ( (pool = client->pools[pool_id]) == NULL )
         return 0;
     client->pools[pool_id] = NULL;

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