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

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1347365214 -7200
# Node ID d189d99ef00c1e197321593d13282e1b57eb4a38
# Parent  fcf567acc92ae57f4adfbe967b01a2ba0390c08f
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>
Committed-by: Jan Beulich <jbeulich@xxxxxxxx>
---


diff -r fcf567acc92a -r d189d99ef00c xen/common/tmem.c
--- a/xen/common/tmem.c Tue Sep 11 14:06:43 2012 +0200
+++ b/xen/common/tmem.c Tue Sep 11 14:06:54 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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