linux-kernel - [35/89] usb: serial: fix memory leak in generic driver

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Message-Id: <20100330225829.991965274@linux.site>
Date:	Tue, 30 Mar 2010 15:57:37 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Johan Hovold <jhovold@...il.com>, Greg KH <greg@...ah.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [35/89] usb: serial: fix memory leak in generic driver

2.6.31-stable review patch.  If anyone has any objections, please let us know.

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

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

commit 2591530204a76fecc843529ade56afe865dd2657 upstream.

Fix a regression introduced by commit
715b1dc01fe44537e8fce9566e4bb48d6821d84b ("USB: usb_debug,
usb_generic_serial: implement multi urb write").

URB transfer buffer was never freed when using multi-urb writes.
Currently the only driver enabling multi-urb writes is usb_debug.

Signed-off-by: Johan Hovold <jhovold@...il.com>
Cc: Greg KH <greg@...ah.com>
Acked-by: Jason Wessel <jason.wessel@...driver.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/serial/generic.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -480,6 +480,8 @@ void usb_serial_generic_write_bulk_callb
 	dbg("%s - port %d", __func__, port->number);
 
 	if (port->serial->type->max_in_flight_urbs) {
+		kfree(urb->transfer_buffer);
+
 		spin_lock_irqsave(&port->lock, flags);
 		--port->urbs_in_flight;
 		port->tx_bytes_flight -= urb->transfer_buffer_length;


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