[Xen-devel] [PATCH 3 of 7] IOMMU: Sanitise pointer work

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Check for null pointers before calling function pointers.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

diff -r 1c3d2e4d06fe -r 68efd418b6f1 xen/drivers/passthrough/iommu.c
--- a/xen/drivers/passthrough/iommu.c   Mon Jun 13 17:45:43 2011 +0100
+++ b/xen/drivers/passthrough/iommu.c   Mon Jun 13 17:45:43 2011 +0100
@@ -407,17 +407,17 @@ unsigned int iommu_read_apic_from_ire(un
     return ops->read_apic_from_ire(apic, reg);
 }
 
-void iommu_resume()
+void iommu_resume(void)
 {
     const struct iommu_ops *ops = iommu_get_ops();
-    if ( iommu_enabled )
+    if ( iommu_enabled && ops && ops->resume )
         ops->resume();
 }
 
-void iommu_suspend()
+void iommu_suspend(void)
 {
     const struct iommu_ops *ops = iommu_get_ops();
-    if ( iommu_enabled )
+    if ( iommu_enabled && ops && ops->suspend )
         ops->suspend();
 }
 

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