From: erictian <erictian@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 12 Sep 2012 08:25:25 +0000 (+0000)
Subject: SecurityPkg/VariableSmm: Fix a VariableSmm bug when reading variable with size 0.
X-Git-Tag: edk2-stable201903~13054
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=ad84df72c7520dba175bafd246bebd5288456544

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 de0a32ee87..c8ee79a1ec 100644
--- a/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c
+++ b/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c
@@ -431,7 +431,7 @@ SmmVariableHandler (
     return EFI_SUCCESS;
   }
 
-  if (*CommBufferSize < sizeof(SMM_VARIABLE_COMMUNICATE_HEADER) - 1) {
+  if (*CommBufferSize < SMM_VARIABLE_COMMUNICATE_HEADER_SIZE) {
     return EFI_SUCCESS;
   }