linux-kernel - [PATCH 3.16.y-ckt 024/183] TPM: Add new TPMs to the tail of the list to prevent inadvertent change of dev

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Message-Id: <1425635874-19087-25-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  6 Mar 2015 09:55:15 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	David Howells <dhowells@...hat.com>,
	Peter Huewe <peterhuewe@....de>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 024/183] TPM: Add new TPMs to the tail of the list to prevent inadvertent change of dev

3.16.7-ckt8 -stable review patch.  If anyone has any objections, please let me know.

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

From: David Howells <dhowells@...hat.com>

commit 398a1e71dc827b994b7f2f56c7c2186fea7f8d75 upstream.

Add newly registered TPMs to the tail of the list, not the beginning, so that
things that are specifying TPM_ANY_NUM don't find that the device they're
using has inadvertently changed.  Adding a second device would break IMA, for
instance.

Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Signed-off-by: Peter Huewe <peterhuewe@....de>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/char/tpm/tpm-interface.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 6af17002a115..cfb9089887bd 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -1122,7 +1122,7 @@ struct tpm_chip *tpm_register_hardware(struct device *dev,
 
 	/* Make chip available */
 	spin_lock(&driver_lock);
-	list_add_rcu(&chip->list, &tpm_chip_list);
+	list_add_tail_rcu(&chip->list, &tpm_chip_list);
 	spin_unlock(&driver_lock);
 
 	return chip;
--
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