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-rw-r--r--SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
index 093932053c..f83e530c5c 100644
--- a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
@@ -984,7 +984,7 @@ IsPkcsSignedDataVerifiedBySignatureList (
// Iterate each Signature Data Node within this CertList for verify.
//
RootCert = Cert->SignatureData;
- RootCertSize = CertList->SignatureSize;
+ RootCertSize = CertList->SignatureSize - sizeof (EFI_GUID);
//
// Call AuthenticodeVerify library to Verify Authenticode struct.