linux-kernel - [PATCH] tpm: tpm_nsc: Fix a double free of pdev in cleanup

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Date:	Thu, 04 Aug 2011 07:58:07 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Leendert van Doorn <leendert@...son.ibm.com>,
	Debora Velarde <debora@...ux.vnet.ibm.com>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	Marcel Selhorst <m.selhorst@...rix.com>,
	tpmdd-devel@...ts.sourceforge.net
Subject: [PATCH] tpm: tpm_nsc: Fix a double free of pdev in cleanup_nsc

platform_device_unregister() will release all resources
and remove it from the subsystem, then drop reference count by
calling platform_device_put().

We should not call kfree(pdev) after platform_device_unregister(pdev).

Signed-off-by: Axel Lin <axel.lin@...il.com>
---
 drivers/char/tpm/tpm_nsc.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c
index 82facc9..4d24648 100644
--- a/drivers/char/tpm/tpm_nsc.c
+++ b/drivers/char/tpm/tpm_nsc.c
@@ -396,8 +396,6 @@ static void __exit cleanup_nsc(void)
 	if (pdev) {
 		tpm_nsc_remove(&pdev->dev);
 		platform_device_unregister(pdev);
-		kfree(pdev);
-		pdev = NULL;
 	}
 
 	platform_driver_unregister(&nsc_drv);
-- 
1.7.4.1



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