SecurityPkg/VariableSmm: Fix a VariableSmm bug when reading variable with size 0.

Signed-off-by: Tian, Feng <feng.tian@intel.com>
Reviewed-by: Zhang, Chao <chao.b.zhang@intel.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13726 6f19259b-4bc3-4df7-8a09-765794883524

diff --git a/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c b/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c
index de0a32ee87e40e0e545d71120da37be3a531292f..c8ee79a1ecd277da161d92fa2ddb5728fb022dba 100644 (file)
--- a/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c
+++ b/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c
@@ -431,7 +431,7 @@ SmmVariableHandler (
     return EFI_SUCCESS;\r
   }\r
 \r
     return EFI_SUCCESS;\r
   }\r
 \r

-  if (*CommBufferSize < sizeof(SMM_VARIABLE_COMMUNICATE_HEADER) - 1) {\r
+  if (*CommBufferSize < SMM_VARIABLE_COMMUNICATE_HEADER_SIZE) {\r

     return EFI_SUCCESS;\r
   }\r
 \r
     return EFI_SUCCESS;\r
   }\r
 \r