linux-kernel - [PATCH] tpm: Fix tpm_send() length calculation

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Message-Id: <20190916073535.25117-1-jarkko.sakkinen@linux.intel.com>
Date:   Mon, 16 Sep 2019 10:35:35 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     linux-integrity@...r.kernel.org
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Mimi Zohar <zohar@...ux.ibm.com>, stable@...r.kernel.org,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] tpm: Fix tpm_send() length calculation

Set the size of the tpm_buf correctly. Now it is set to the header
length by tpm_buf_init().

Reported-by: Mimi Zohar <zohar@...ux.ibm.com>
Cc: stable@...r.kernel.org
Fixes: 412eb585587a ("use tpm_buf in tpm_transmit_cmd() as the IO parameter")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 drivers/char/tpm/tpm-interface.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index d9ace5480665..4aa7e7f91139 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -363,6 +363,8 @@ int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
 		goto out;
 
 	memcpy(buf.data, cmd, buflen);
+	buf.length = buflen;
+
 	rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to a send a command");
 	tpm_buf_destroy(&buf);
 out:
-- 
2.20.1