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MdeModulePkg DxeS3BootScriptLib: Check (mSmst != NULL) before freeing SMRAM 

There is static scan tool reports BootScriptSave.c:628:'mSmst' is
explicitly dereferenced.

The patch is to check (mSmst != NULL) before freeing SMRAM at
BootScriptSave.c:628.

Cc: Shumin Qiu <shumin.qiu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Shumin Qiu <shumin.qiu@intel.com>
This commit is contained in:
Star Zeng 2016-06-12 12:45:09 +08:00
parent 3900a7437e
commit d6f38e374e
1 changed files with 1 additions and 1 deletions
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2
MdeModulePkg/Library/PiDxeS3BootScriptLib/BootScriptSave.c
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@ -624,7 +624,7 @@ S3BootScriptLibDeinitialize (
Status = PcdSet64S (PcdS3BootScriptTablePrivateDataPtr, 0);
ASSERT_EFI_ERROR (Status);
}
if (mS3BootScriptTableSmmAllocated) {
if ((mSmst != NULL) && mS3BootScriptTableSmmAllocated) {
Status = mSmst->SmmFreePool (mS3BootScriptTableSmmPtr);
ASSERT_EFI_ERROR (Status);
Status = PcdSet64S (PcdS3BootScriptTablePrivateSmmDataPtr, 0);