diff options
Diffstat (limited to 'OvmfPkg')
| -rw-r--r-- | OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c index 8b98208591..22077851a4 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxe.c @@ -20,6 +20,7 @@ #include <Protocol/IoMmu.h>
#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
#include <Library/IoLib.h>
#include <Library/DebugLib.h>
#include <Library/QemuFwCfgLib.h>
@@ -189,6 +190,12 @@ AllocFwCfgDmaAccessBuffer ( }
//
+ // Avoid exposing stale data even temporarily: zero the area before mapping
+ // it.
+ //
+ ZeroMem (HostAddress, Size);
+
+ //
// Map the host buffer with BusMasterCommonBuffer64
//
Status = mIoMmuProtocol->Map (
|