linux-kernel - Re: [PATCH 5.10 089/100] net: cpsw: Properly initialise struct page_pool

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Message-ID: <YfkNgUDVl2mLsL6d@kroah.com>
Date:   Tue, 1 Feb 2022 11:37:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Colin Foster <colin.foster@...advantage.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.10 089/100] net: cpsw: Properly initialise struct
 page_pool_params

On Mon, Jan 31, 2022 at 12:19:09PM -0800, Colin Foster wrote:
> On Mon, Jan 31, 2022 at 11:56:50AM +0100, Greg Kroah-Hartman wrote:
> > From: Toke Høiland-Jørgensen <toke@...hat.com>
> > 
> > [ Upstream commit c63003e3d99761afb280add3b30de1cf30fa522b ]
> > 
> > The cpsw driver didn't properly initialise the struct page_pool_params
> > before calling page_pool_create(), which leads to crashes after the struct
> > has been expanded with new parameters.
> > 
> > The second Fixes tag below is where the buggy code was introduced, but
> > because the code was moved around this patch will only apply on top of the
> > commit in the first Fixes tag.
> > 
> > Fixes: c5013ac1dd0e ("net: ethernet: ti: cpsw: move set of common functions in cpsw_priv")
> > Fixes: 9ed4050c0d75 ("net: ethernet: ti: cpsw: add XDP support")
> 
> In 5.4 every parameter is individually initialized, so there really
> isn't a "bug" necessarily. Only at commit e68bc75691cc does it actually
> start not initializing every parameter.
> 
> https://elixir.bootlin.com/linux/v5.4.175/source/drivers/net/ethernet/ti/cpsw.c#L558
> 
> I'm not familiar with the process of backporting fixes to stable yet. Is
> there any benefit in this cleanup for 5.4 or is it fine to leave it?

Let's be safe and leave it.

thanks,

greg k-h