[Xen-devel] [PATCH 6/9] cpufreq: missing check of copy_from_guest()

[Tim Deegan <tim@xxxxxxx>]

Coverity CID 1055131
Coverity CID 1055132

Signed-off-by: Tim Deegan <tim@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Liu Jinsong <jinsong.liu@xxxxxxxxx>
---
 xen/drivers/cpufreq/cpufreq.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/xen/drivers/cpufreq/cpufreq.c b/xen/drivers/cpufreq/cpufreq.c
index 0de5d41..ab66884 100644
--- a/xen/drivers/cpufreq/cpufreq.c
+++ b/xen/drivers/cpufreq/cpufreq.c
@@ -471,8 +471,12 @@ int set_px_pminfo(uint32_t acpi_id, struct 
xen_processor_performance *dom0_px_in
             ret = -ENOMEM;
             goto out;
         }
-        copy_from_guest(pxpt->states, dom0_px_info->states, 
-                                      dom0_px_info->state_count);
+        if ( copy_from_guest(pxpt->states, dom0_px_info->states,
+                             dom0_px_info->state_count) )
+        {
+            ret = -EFAULT;
+            goto out;
+        }
         pxpt->state_count = dom0_px_info->state_count;
 
         if ( cpufreq_verbose )
-- 
1.7.10.4


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