linux-kernel - [PATCH] TPM: Add new TPMs to the tail of the list to prevent inadvertent change of dev

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Date:	Fri, 12 Sep 2014 10:55:35 +0100
From:	David Howells <dhowells@...hat.com>
To:	jmorris@...ei.org
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	linux-security-module@...r.kernel.org,
	tpmdd-devel@...ts.sourceforge.net, Peter Huewe <peterhuewe@....de>
Subject: [PATCH] TPM: Add new TPMs to the tail of the list to prevent
 inadvertent change of dev

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>
cc: stable@...r.kernel.org
---

 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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