netdev - Re: [PATCH] atm: fix atm_dev refcnt leaks in atmtcp_remove

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Message-Id: <20200730.173610.1651631339985656912.davem@davemloft.net>
Date:   Thu, 30 Jul 2020 17:36:10 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     xiongx18@...an.edu.cn
Cc:     3chas3@...il.com, linux-atm-general@...ts.sourceforge.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        xiyuyang19@...an.edu.cn, tanxin.ctf@...il.com,
        yuanxzhang@...an.edu.cn
Subject: Re: [PATCH] atm: fix atm_dev refcnt leaks in
 atmtcp_remove_persistent

From: Xin Xiong <xiongx18@...an.edu.cn>
Date: Wed, 29 Jul 2020 21:06:59 +0800

> atmtcp_remove_persistent() invokes atm_dev_lookup(), which returns a
> reference of atm_dev with increased refcount or NULL if fails.
> 
> The refcount leaks issues occur in two error handling paths. If
> dev_data->persist is zero or PRIV(dev)->vcc isn't NULL, the function
> returns 0 without decreasing the refcount kept by a local variable,
> resulting in refcount leaks.
> 
> Fix the issue by adding atm_dev_put() before returning 0 both when
> dev_data->persist is zero or PRIV(dev)->vcc isn't NULL.
> 
> Signed-off-by: Xin Xiong <xiongx18@...an.edu.cn>
> Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
> Signed-off-by: Xin Tan <tanxin.ctf@...il.com>

Applied, thank you.