linux-kernel - [PATCH v2 2/4] tpm: fix: rollback when devm_add

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Date:	Sat, 13 Feb 2016 15:47:05 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	David Howells <dhowells@...hat.com>
Cc:	jmorris@...ei.org,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	tpmdd-devel@...ts.sourceforge.net (moderated list:TPM DEVICE DRIVER),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 2/4] tpm: fix: rollback when devm_add_action() fails

Call put_device() and return error code if devm_add_action() fails.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Reported-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Fixes: 8e0ee3c9faed ("tpm: fix the cleanup of struct tpm_chip")
---
 drivers/char/tpm/tpm-chip.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 2521425..274dd01 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -88,6 +88,7 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev,
 				 const struct tpm_class_ops *ops)
 {
 	struct tpm_chip *chip;
+	int rc;
 
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL)
@@ -136,7 +137,11 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev,
 	chip->cdev.owner = chip->pdev->driver->owner;
 	chip->cdev.kobj.parent = &chip->dev.kobj;
 
-	devm_add_action(dev, (void (*)(void *)) put_device, &chip->dev);
+	rc = devm_add_action(dev, (void (*)(void *)) put_device, &chip->dev);
+	if (rc) {
+		put_device(&chip->dev);
+		return ERR_PTR(rc);
+	}
 
 	return chip;
 }
-- 
2.7.0