linux-kernel - [ 14/75] [PATCH] Bluetooth: uart-ldisc: Fix memory leak

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Date:	Thu, 19 Apr 2012 14:03:17 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	David Herrmann <dh.herrmann@...glemail.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	Johan Hedberg <johan.hedberg@...el.com>,
	Johan Hovold <jhovold@...il.com>
Subject: [ 14/75] [PATCH] Bluetooth: uart-ldisc: Fix memory leak

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

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

From: Johan Hovold <jhovold@...il.com>

This is a partial, self-contained, minimal backport of commit
797fe796c4335b35d95d5326824513befdb5d1e9 upstream which fixes the memory
leak:

Bluetooth: uart-ldisc: Fix memory leak and remove destruct cb

We currently leak the hci_uart object if HCI_UART_PROTO_SET is never set
because the hci-destruct callback will then never be called.  This fix
removes the hci-destruct callback and frees the driver internal private
hci_uart object directly on tty-close. We call hci_unregister_dev() here
so the hci-core will never call our callbacks again (except destruct).
Therefore, we can safely free the driver internal data right away and
set the destruct callback to NULL.

Signed-off-by: David Herrmann <dh.herrmann@...glemail.com>
Acked-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@...el.com>
Signed-off-by: Johan Hovold <jhovold@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/bluetooth/hci_ldisc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -237,7 +237,6 @@ static void hci_uart_destruct(struct hci
 		return;
 
 	BT_DBG("%s", hdev->name);
-	kfree(hdev->driver_data);
 }
 
 /* ------ LDISC part ------ */
@@ -316,6 +315,7 @@ static void hci_uart_tty_close(struct tt
 				hci_free_dev(hdev);
 			}
 		}
+		kfree(hu);
 	}
 }
 


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