Ian Campbell
2011-Jan-17 14:16 UTC
[Xen-devel] [PATCH] xen: fix XEN_DOMCTL_memory_mapping to not return with domain RCU lock held
# HG changeset patch
# User Ian Campbell <ian.campbell@citrix.com>
# Date 1295273571 0
# Node ID dc8400e0efaff5251f642d8a98dba836719134c5
# Parent 15e53a2463f084c3adbbb21b4deb30d0d4f79b45
xen: fix XEN_DOMCTL_memory_mapping to not return with domain RCU lock held
Broken in 20358:ecc649ec3675
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
diff -r 15e53a2463f0 -r dc8400e0efaf xen/arch/x86/domctl.c
--- a/xen/arch/x86/domctl.c Mon Jan 17 14:12:50 2011 +0000
+++ b/xen/arch/x86/domctl.c Mon Jan 17 14:12:51 2011 +0000
@@ -965,13 +965,13 @@ long arch_do_domctl(
if ( (mfn + nr_mfns - 1) < mfn ) /* wrap? */
break;
- ret = -ESRCH;
- if ( unlikely((d = rcu_lock_domain_by_id(domctl->domain)) == NULL) )
- break;
-
ret = -EPERM;
if ( !IS_PRIV(current->domain) &&
!iomem_access_permitted(current->domain, mfn, mfn + nr_mfns -
1) )
+ break;
+
+ ret = -ESRCH;
+ if ( unlikely((d = rcu_lock_domain_by_id(domctl->domain)) == NULL) )
break;
ret=0;
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