linux-kernel - [PATCH 3.13.y-ckt 032/143] tpm/tpm_i2c_stm_st33: Add status check when reading data on the FIFO

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Message-Id: <1427831308-1854-33-git-send-email-kamal@canonical.com>
Date:	Tue, 31 Mar 2015 12:46:37 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Christophe Ricard <christophe-h.ricard@...com>,
	Peter Huewe <peterhuewe@....de>,
	Luis Henriques <luis.henriques@...onical.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 032/143] tpm/tpm_i2c_stm_st33: Add status check when reading data on the FIFO

3.13.11-ckt18 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe Ricard <christophe.ricard@...il.com>

commit c4eadfafb91d5501095c55ffadaa1168743f39d3 upstream.

Add a return value check when reading data from the FIFO register.

Reviewed-by: Jason Gunthorpe <jason.gunthorpe@...idianresearch.com>
Signed-off-by: Christophe Ricard <christophe-h.ricard@...com>
Reviewed-by: Peter Huewe <peterhuewe@....de>
Signed-off-by: Peter Huewe <peterhuewe@....de>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 2a95ca3..0fa5a16 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -398,7 +398,7 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
  */
 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 {
-	int size = 0, burstcnt, len;
+	int size = 0, burstcnt, len, ret;
 	struct i2c_client *client;
 
 	client = (struct i2c_client *)TPM_VPRIV(chip);
@@ -413,7 +413,10 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 		if (burstcnt < 0)
 			return burstcnt;
 		len = min_t(int, burstcnt, count - size);
-		I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
+		ret = I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
+		if (ret < 0)
+			return ret;
+
 		size += len;
 	}
 	return size;
-- 
1.9.1

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