From: Keir Fraser <keir.fraser@citrix.com>
Date: Wed, 19 May 2010 17:38:19 +0000 (+0100)
Subject: kexec: Fix dodgy use of cpu_present_map protecting percpu data access.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~12111
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=cb11cb5896122f5ba0ab85886aae99ccca9d641a;p=xen.git

kexec: Fix dodgy use of cpu_present_map protecting percpu data access.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
---

diff --git a/xen/common/kexec.c b/xen/common/kexec.c
index e4dc1f0390..263faebcf5 100644
--- a/xen/common/kexec.c
+++ b/xen/common/kexec.c
@@ -271,7 +271,7 @@ static int kexec_get_cpu(xen_kexec_range_t *range)
     int nr = range->nr;
     int nr_bytes = 0;
 
-    if ( nr < 0 || nr >= num_present_cpus() )
+    if ( nr < 0 || nr >= NR_CPUS || !cpu_online(nr) )
         return -EINVAL;
 
     nr_bytes += sizeof_note("CORE", sizeof(ELF_Prstatus));