linux-kernel - Re: [PATCH] net: axienet: fix a potential double free in axienet

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Message-Id: <20190708.163235.455094269982602106.davem@davemloft.net>
Date:   Mon, 08 Jul 2019 16:32:35 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     wen.yang99@....com.cn
Cc:     linux-kernel@...r.kernel.org, xue.zhihong@....com.cn,
        wang.yi59@....com.cn, cheng.shengyu@....com.cn, anirudh@...inx.com,
        John.Linn@...inx.com, michal.simek@...inx.com,
        hancock@...systems.ca, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] net: axienet: fix a potential double free in
 axienet_probe()

From: Wen Yang <wen.yang99@....com.cn>
Date: Sat, 6 Jul 2019 11:38:41 +0800

> There is a possible use-after-free issue in the axienet_probe():
> 
> 1701:	np = of_parse_phandle(pdev->dev.of_node, "axistream-connected", 0);
> 1702:   if (np) {
> ...
> 1787:		of_node_put(np); ---> released here
> 1788:		lp->eth_irq = platform_get_irq(pdev, 0);
> 1789:	} else {
> ...
> 1801:	}
> 1802:	if (IS_ERR(lp->dma_regs)) {
> ...
> 1805:		of_node_put(np); ---> double released here
> 1806:		goto free_netdev;
> 1807:	}
> 
> We solve this problem by removing the unnecessary of_node_put().
> 
> Fixes: 28ef9ebdb64c ("net: axienet: make use of axistream-connected attribute optional")
> Signed-off-by: Wen Yang <wen.yang99@....com.cn>

Applied to net-next