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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: linux-integrity@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	Peter Huewe <PeterHuewe@gmx.de>, Jason Gunthorpe <jgg@ziepe.ca>,
	Stefan Berger <stefanb@linux.vnet.ibm.com>,
	Alexander Steffen <Alexander.Steffen@infineon.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	stable@vger.kernel.org
Subject: [PATCH v2 2/2] tpm/tpm_i2c_atmel: Return -E2BIG when the transfer is incomplete
Date: Fri,  8 Feb 2019 18:03:28 +0200	[thread overview]
Message-ID: <20190208160328.18715-3-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20190208160328.18715-1-jarkko.sakkinen@linux.intel.com>

Return -E2BIG when the transfer is incomplete. The upper layer does
not retry, so not doing that is incorrect behaviour.

Cc: stable@vger.kernel.org
Fixes: a2871c62e186 ("tpm: Add support for Atmel I2C TPMs")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm_i2c_atmel.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
index aa11c8a1df5e..8a7e80923091 100644
--- a/drivers/char/tpm/tpm_i2c_atmel.c
+++ b/drivers/char/tpm/tpm_i2c_atmel.c
@@ -69,6 +69,10 @@ static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len)
 	if (status < 0)
 		return status;
 
+	/* The upper layer does not support incomplete sends. */
+	if (status != len)
+		return -E2BIG;
+
 	return 0;
 }
 
-- 
2.19.1


  parent reply	other threads:[~2019-02-08 16:03 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-08 16:03 [PATCH v2 0/2] tpm: Unify send() callbacks Jarkko Sakkinen
2019-02-08 16:03 ` [PATCH v2 1/2] tpm: Unify the send callback behaviour Jarkko Sakkinen
2019-02-08 16:03 ` Jarkko Sakkinen [this message]
2019-02-08 16:14 ` [PATCH v2 0/2] tpm: Unify send() callbacks Stefan Berger
2019-02-08 16:23   ` Jarkko Sakkinen

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