linux-kernel - Re: [PATCH] usb: cdc_acm: Do not leak URB buffers

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Message-ID: <1537535934.15252.3.camel@suse.com>
Date:   Fri, 21 Sep 2018 15:18:54 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Romain Izard <romain.izard.pro@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH] usb: cdc_acm: Do not leak URB buffers

On Do, 2018-09-20 at 16:49 +0200, Romain Izard wrote:
> When the ACM TTY port is disconnected, the URBs it uses must be killed, and
> then the buffers must be freed. Unfortunately a previous refactor removed
> the code freeing the buffers because it looked extremely similar to the
> code killing the URBs.
> 
> As a result, there were many new leaks for each plug/unplug cycle of a
> CDC-ACM device, that were detected by kmemleak.
> 
> Restore the missing code, and the memory leak is removed.

Try as i may, I don't see the difference. Could you put a comment
exactly describing the issue into the code itself, lest this problem
reappear?

	Regards
		Oliver