From: Wu Fengguang <fengguang.wu@intel.com>
Date: Mon, 23 Mar 2009 20:51:27 +0000 (-0300)
Subject: KVM: Prevent trace call into unloaded module text
X-Git-Tag: v2.6.28.10~25
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3b3d3c98c95ea353d95299016973b99f569f6c64;p=thirdparty%2Fkernel%2Fstable.git

KVM: Prevent trace call into unloaded module text

(cherry picked from b82091824ee4970adf92d5cd6d57b12273171625)

Add marker_synchronize_unregister() before module unloading.
This prevents possible trace calls into unloaded module text.

Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/virt/kvm/kvm_trace.c b/virt/kvm/kvm_trace.c
index 41dcc845f78c3..f59874446440c 100644
--- a/virt/kvm/kvm_trace.c
+++ b/virt/kvm/kvm_trace.c
@@ -252,6 +252,7 @@ void kvm_trace_cleanup(void)
 			struct kvm_trace_probe *p = &kvm_trace_probes[i];
 			marker_probe_unregister(p->name, p->probe_func, p);
 		}
+		marker_synchronize_unregister();
 
 		relay_close(kt->rchan);
 		debugfs_remove(kt->lost_file);