netdev - Re: [PATCH 1/2] net: ll_temac: fix DMA resources leak

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Message-ID: <20230127232034.1da0f4e1@kernel.org>
Date:   Fri, 27 Jan 2023 23:20:34 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jonas Suhr Christensen <jsc@...raculum.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, michal.simek@...inx.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        esben@...nix.com
Subject: Re: [PATCH 1/2] net: ll_temac: fix DMA resources leak

On Thu, 26 Jan 2023 11:16:06 +0100 Jonas Suhr Christensen wrote:
> Add missing conversion of address when unmapping dma region causing
> unmapping to silently fail. At some point resulting in buffer
> overrun eg. when releasing device.

Could you add a Fixes tag pointing to the commit which introduced 
the bug? It will help the stable teams backport the patch.

When reposting please put [PATCH net v2] as the prefix (noting 
the target tree for the benefit of bots/CIs).

> Signed-off-by: Jonas Suhr Christensen <jsc@...raculum.org>
> ---
>  drivers/net/ethernet/xilinx/ll_temac_main.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
> index 1066420d6a83..66c04027f230 100644
> --- a/drivers/net/ethernet/xilinx/ll_temac_main.c
> +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
> @@ -300,6 +300,7 @@ static void temac_dma_bd_release(struct net_device *ndev)
>  {
>  	struct temac_local *lp = netdev_priv(ndev);
>  	int i;
> +	struct cdmac_bd *bd;

nit: we like variable declarations longest to shortest in networking
 so before the int i; pls

>  	/* Reset Local Link (DMA) */
>  	lp->dma_out(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);