linux-kernel - Re: [PATCH net] net: ethernet: mtk_eth_soc: fix memory corruption during fq dma init

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Message-ID: <20241015123907.GG569285@kernel.org>
Date: Tue, 15 Oct 2024 13:39:07 +0100
From: Simon Horman <horms@...nel.org>
To: Felix Fietkau <nbd@....name>
Cc: netdev@...r.kernel.org, Sean Wang <sean.wang@...iatek.com>,
	Mark Lee <Mark-MC.Lee@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Frank Wunderlich <frank-w@...lic-files.de>,
	Jacob Keller <jacob.e.keller@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net] net: ethernet: mtk_eth_soc: fix memory corruption
 during fq dma init

On Tue, Oct 15, 2024 at 10:17:55AM +0200, Felix Fietkau wrote:
> The loop responsible for allocating up to MTK_FQ_DMA_LENGTH buffers must
> only touch as many descriptors, otherwise it ends up corrupting unrelated
> memory. Fix the loop iteration count accordingly.
> 
> Fixes: c57e55819443 ("net: ethernet: mtk_eth_soc: handle dma buffer size soc specific")
> Signed-off-by: Felix Fietkau <nbd@....name>

Reviewed-by: Simon Horman <horms@...nel.org>