linux-kernel - Re: [PATCH net v2] net: mvpp2: fix possible invalid pointer dereference

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Message-ID: <Y3O1V4FAACa9Ed9S@lunn.ch>
Date:   Tue, 15 Nov 2022 16:50:47 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Hui Tang <tanghui20@...wei.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        mw@...ihalf.com, linux@...linux.org.uk, leon@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        yusongping@...wei.com
Subject: Re: [PATCH net v2] net: mvpp2: fix possible invalid pointer
 dereference

On Tue, Nov 15, 2022 at 05:04:33PM +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().

As i pointed out for the MDIO driver, i wonder if this is the correct
fix. mvpp2_get_sram() is probably a better place to handle this

In fact, please add a devm_ioremap_resource_optional() which returns
NULL if the resource does not exist, or an error code for real errors,
and make drivers fail the probe on real errors.

	Andrew