linux-kernel - Re: [Patch] btusb: fix a memory leak in btusb_send

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Date:	Thu, 1 Dec 2011 21:47:41 +0900
From:	Gustavo Padovan <padovan@...fusion.mobi>
To:	Cong Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Marcel Holtmann <marcel@...tmann.org>,
	linux-bluetooth@...r.kernel.org
Subject: Re: [Patch] btusb: fix a memory leak in btusb_send_frame()

Hi Cong,

* Cong Wang <amwang@...hat.com> [2011-11-22 09:32:57 +0800]:

> This patch fixes the following memory leak reported by kmemleak:
> 
> unreferenced object 0xffff880060a53840 (size 192):
>   comm "softirq", pid 0, jiffies 4320571771 (age 1406.569s)
>   hex dump (first 32 bytes):
>     01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff81138a1c>] create_object+0x187/0x28b
>     [<ffffffff814be12e>] kmemleak_alloc+0x73/0x98
>     [<ffffffff811289d3>] __kmalloc+0xfc/0x123
>     [<ffffffff81386546>] usb_alloc_urb+0x1e/0x48
>     [<ffffffffa0130274>] btusb_send_frame+0x86/0x385 [btusb]
>     [<ffffffffa02d8230>] hci_send_frame+0xa0/0xa5 [bluetooth]
>     [<ffffffffa02d8a4e>] hci_cmd_task+0xa0/0xfb [bluetooth]
>     [<ffffffff81058548>] tasklet_action+0x8f/0xef
>     [<ffffffff81058a4c>] __do_softirq+0xf4/0x1db
>     [<ffffffff81058bb7>] run_ksoftirqd+0x84/0x129
>     [<ffffffff8106f1c4>] kthread+0xa0/0xa8
>     [<ffffffff814dd144>] kernel_thread_helper+0x4/0x10
>     [<ffffffffffffffff>] 0xffffffffffffffff
> 
> The problem is that when inc_tx() returns non-zero, we forgot
> to call usb_free_urb().
> 
> Cc: Marcel Holtmann <marcel@...tmann.org>
> Cc: "Gustavo F. Padovan" <padovan@...fusion.mobi>
> Signed-off-by: WANG Cong <amwang@...hat.com>
> 
> ---
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index fe4ebc3..eabc437 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -777,9 +777,8 @@ skip_waking:
>  		usb_mark_last_busy(data->udev);
>  	}
>  
> -	usb_free_urb(urb);
> -
>  done:
> +	usb_free_urb(urb);
>  	return err;
>  }

Patch has been applied, thanks.

	Gustavo
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