From 829bf0675272d24ba0056f5f79e09544464f0c8d Mon Sep 17 00:00:00 2001
From: Stefan Berger <stefanb@linux.vnet.ibm.com>
Date: Wed, 30 Mar 2011 12:13:26 -0400
Subject: tpm: Use interface timeouts returned from the TPM

The TPM driver currently discards the interface timeout values returned
from the TPM. The check of the response packet needs to consider that
the return_code field is 0 on success and the size of the expected
packet is equivalent to the header size + u32 length indicator for the
TPM_GetCapability() result + 4 interface timeout indicators of type u32.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
---
 drivers/char/tpm/tpm.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'drivers')

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 27abfd9..0a475c7 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -545,9 +545,10 @@ void tpm_get_timeouts(struct tpm_chip *chip)
 	if (rc)
 		goto duration;
 
-	if (be32_to_cpu(tpm_cmd.header.out.length)
-	    != 4 * sizeof(u32))
-		goto duration;
+	if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
+	    be32_to_cpu(tpm_cmd.header.out.length)
+	    != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
+		return;
 
 	timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
 	/* Don't overwrite default if value is 0 */
-- 
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