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Message-ID: <20221115202850.7beeea87@kernel.org>
Date: Tue, 15 Nov 2022 20:28:50 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Hui Tang <tanghui20@...wei.com>
Cc: <davem@...emloft.net>, <edumazet@...gle.com>, <mw@...ihalf.com>,
<linux@...linux.org.uk>, <leon@...nel.org>, <andrew@...n.ch>,
<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<yusongping@...wei.com>
Subject: Re: [PATCH net v4] net: mvpp2: fix possible invalid pointer
dereference
On Wed, 16 Nov 2022 10:14:37 +0800 Hui Tang wrote:
> It will cause invalid pointer dereference to priv->cm3_base behind,
> if PTR_ERR(priv->cm3_base) in mvpp2_get_sram().
>
> Fixes: a59d354208a7 ("net: mvpp2: enable global flow control")
> Signed-off-by: Hui Tang <tanghui20@...wei.com>
Please do not repost new versions so often:
https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#tl-dr
do not use --in-reply-to
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> index d98f7e9a480e..efb582b63640 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> @@ -7349,6 +7349,7 @@ static int mvpp2_get_sram(struct platform_device *pdev,
> struct mvpp2 *priv)
> {
> struct resource *res;
> + void __iomem *base;
>
> res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> if (!res) {
> @@ -7359,9 +7360,11 @@ static int mvpp2_get_sram(struct platform_device *pdev,
> return 0;
> }
>
> - priv->cm3_base = devm_ioremap_resource(&pdev->dev, res);
> + base = devm_ioremap_resource(&pdev->dev, res);
> + if (!IS_ERR(base))
> + priv->cm3_base = base;
>
> - return PTR_ERR_OR_ZERO(priv->cm3_base);
> + return PTR_ERR_OR_ZERO(base);
Use the idiomatic error handling, keep success path un-indented:
ptr = function();
if (IS_ERR(ptr))
return PTR_ERR(ptr);
priv->bla = ptr;
return 0;
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