linux-kernel - [PATCH] pcmcia: cs: fix possible hung task and memory leak pccardd()

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Date:   Sat, 12 Nov 2022 17:25:41 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <linux@...inikbrodowski.net>
Subject: [PATCH] pcmcia: cs: fix possible hung task and memory leak pccardd()

If device_register() returns error in pccardd(), it leads two issues:

1. The socket_released has never been completed, it will block
   pcmcia_unregister_socket(), because of waiting for completion
   of socket_released.
2. The device name allocated by dev_set_name() is leaked.

Fix this two issues by calling put_device() when device_register() fails.
socket_released can be completed in pcmcia_release_socket(), the name can
be freed in kobject_cleanup().

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/pcmcia/cs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index f70197154a36..820cce7c8b40 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -605,6 +605,7 @@ static int pccardd(void *__skt)
 		dev_warn(&skt->dev, "PCMCIA: unable to register socket\n");
 		skt->thread = NULL;
 		complete(&skt->thread_done);
+		put_device(&skt->dev);
 		return 0;
 	}
 	ret = pccard_sysfs_add_socket(&skt->dev);
-- 
2.25.1