The code blindly assumes a TIS interface is present in case both CRB and
FIFO checks fail. Check the InterfaceType for TIS instead and only
return Tpm2PtpInterfaceTis in case it matches, Tpm2PtpInterfaceMax
otherwise.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c
b/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c
index 1f9ac5ab5a30..eac9f0e29941 100644
--- a/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c
+++ b/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2Ptp.c
@@ -464,7 +464,11 @@ Tpm2GetPtpInterface (
return Tpm2PtpInterfaceFifo;
}
- return Tpm2PtpInterfaceTis;
+ if (InterfaceId.Bits.InterfaceType ==
PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_TIS) {
+ return Tpm2PtpInterfaceTis;
+ }
+
+ return Tpm2PtpInterfaceMax;
}
/**
--
2.40.0
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