linux-kernel - [PATCH] virtio: console: fix error handling in init() function

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Date:	Sat,  1 Sep 2012 23:49:37 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, ldv-project@...ras.ru
Subject: [PATCH] virtio: console: fix error handling in init() function

If register_virtio_driver() fails, virtio-ports class is not destroyed.
The patch adds error handling of register_virtio_driver().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/char/virtio_console.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index cdf2f54..060a672 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1941,7 +1941,17 @@ static int __init init(void)
 	INIT_LIST_HEAD(&pdrvdata.consoles);
 	INIT_LIST_HEAD(&pdrvdata.portdevs);
 
-	return register_virtio_driver(&virtio_console);
+	err = register_virtio_driver(&virtio_console);
+	if (err < 0) {
+		pr_err("Error %d registering virtio driver\n", err);
+		goto free;
+	}
+	return 0;
+free:
+	if (pdrvdata.debugfs_dir)
+		debugfs_remove_recursive(pdrvdata.debugfs_dir);
+	class_destroy(pdrvdata.class);
+	return err;
 }
 
 static void __exit fini(void)
-- 
1.7.9.5

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