From ecfc3b4c1e9a59c6a230398bced24118d19ea099 Mon Sep 17 00:00:00 2001

From: William Roberts <william.c.roberts@intel.com>

Date: Thu, 7 Jul 2022 09:00:19 -0500

Subject: [PATCH 23/23] SAPI: fix number of handles for FlushContext

The lookup table for the number of command handles for

Tss2_Sys_FlushContext has the count set to 1, when in reality the

command takes no handles in the handle area but a handle as the input

parameter. This works currently because handles and parameters are just

concatenated and the parsing logic on the TPM just unpacks them, so in

this case, thet're in the same spot with the same value. This goes

unnoticed until you call Tss2_Sys_GetCpBuffer and the buffer is empty as

the logic things its a handle in the handle area and not a handle in the

parameter area.

Signed-off-by: William Roberts <william.c.roberts@intel.com>

---

 src/tss2-sys/sysapi_util.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tss2-sys/sysapi_util.c b/src/tss2-sys/sysapi_util.c

index d84acc5d..a92f47a2 100644

--- a/src/tss2-sys/sysapi_util.c

+++ b/src/tss2-sys/sysapi_util.c

@@ -262,7 +262,7 @@ static int GetNumHandles(TPM2_CC commandCode, bool req)

         { TPM2_CC_FirmwareRead, 0, 0 },

         { TPM2_CC_ContextSave, 1, 0 },

         { TPM2_CC_ContextLoad, 0, 1 },

-        { TPM2_CC_FlushContext, 1, 0 },

+        { TPM2_CC_FlushContext, 0, 0 },

         { TPM2_CC_EvictControl, 2, 0 },

         { TPM2_CC_ReadClock, 0, 0 },

         { TPM2_CC_ClockSet, 1, 0 },

-- 

2.34.3