linux-kernel - [ 187/221] EDAC: Fix kernel panic on module unloading

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Date:	Tue, 15 Jan 2013 10:51:54 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Denis Kirjanov <kirjanov@...il.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Borislav Petkov <bp@...e.de>
Subject: [ 187/221] EDAC: Fix kernel panic on module unloading

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

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

From: Konstantin Khlebnikov <khlebnikov@...nvz.org>

commit 311bd84247ee0bedae6cdfbfc5e2c3450f9decd1 upstream.

This patch fixes use-after-free and double-free bugs in
edac_mc_sysfs_exit(). mci_pdev has single reference and put_device()
calls mc_attr_release() which calls kfree(). The following
device_del() works with already released memory. An another kfree() in
edac_mc_sysfs_exit() releses the same memory again. Great.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc: Denis Kirjanov <kirjanov@...il.com>
Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
Link: http://lkml.kernel.org/r/20121214110310.11019.21098.stgit@zurg
Signed-off-by: Borislav Petkov <bp@...en8.de>
[ a partial 3.7.y backport ]
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/edac/edac_mc_sysfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -1145,7 +1145,7 @@ int __init edac_mc_sysfs_init(void)
 
 void __exit edac_mc_sysfs_exit(void)
 {
-	put_device(mci_pdev);
 	device_del(mci_pdev);
+	put_device(mci_pdev);
 	edac_put_sysfs_subsys();
 }


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