From: David Miller <davem@davemloft.net>
To: oneukum@suse.de
Cc: hemantk@codeaurora.org, gregkh@linuxfoundation.org,
netdev@vger.kernel.org, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH] net: usb: Fix memory leak on Tx data path
Date: Fri, 26 Oct 2012 03:43:48 -0400 (EDT) [thread overview]
Message-ID: <20121026.034348.679271630151161129.davem@davemloft.net> (raw)
In-Reply-To: <4122165.gxBpJlT6o2@linux-lqwf.site>
From: Oliver Neukum <oneukum@suse.de>
Date: Fri, 26 Oct 2012 09:39:16 +0200
> On Thursday 25 October 2012 21:17:54 Hemant Kumar wrote:
>> Driver anchors the tx urbs and defers the urb submission if
>> a transmit request comes when the interface is suspended.
>> Anchoring urb increments the urb reference count. These
>> deferred urbs are later accessed by calling usb_get_from_anchor()
>> for submission during interface resume. usb_get_from_anchor()
>> unanchors the urb but urb reference count remains same.
>> This causes the urb reference count to remain non-zero
>> after usb_free_urb() gets called and urb never gets freed.
>> Hence call usb_put_urb() after anchoring the urb to properly
>> balance the reference count for these deferred urbs. Also,
>> unanchor these deferred urbs during disconnect, to free them
>> up.
>
> Good catch. This needs to go into stable, too.
>>
>> Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
> Acked-by: Oliver Neukum <oneukum@suse.de>
Applied and queued up for -stable.
prev parent reply other threads:[~2012-10-26 7:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-26 4:17 [PATCH] net: usb: Fix memory leak on Tx data path Hemant Kumar
2012-10-26 7:39 ` Oliver Neukum
2012-10-26 7:43 ` David Miller [this message]
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