netdev - Re: [PATCH] net: stmmac: fix kernel panic due to NULL pointer dereference of mdio_bus

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Message-ID: <20210530141623.33d2d00d@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Sun, 30 May 2021 14:16:23 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Sriranjani P <sriranjani.p@...sung.com>
Cc:     netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, peppe.cavallaro@...com,
        alexandre.torgue@...s.st.com, joabreu@...opsys.com,
        davem@...emloft.net, mcoquelin.stm32@...il.com,
        linux@...linux.org.uk, boon.leong.ong@...el.com,
        Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: Re: [PATCH] net: stmmac: fix kernel panic due to NULL pointer
 dereference of mdio_bus_data

On Fri, 28 May 2021 12:40:56 +0530 Sriranjani P wrote:
> Fixed link does not need mdio bus and in that case mdio_bus_data will
> not be allocated. Before using mdio_bus_data we should check for NULL.
> 
> This patch fix the kernel panic due to NULL pointer dereference of
> mdio_bus_data when it is not allocated.
> 
> Without this patch we do see following kernel crash caused due to kernel
> NULL pointer dereference.

Applied, thanks.