linux-kernel - Re: [PATCH stable v4.14 1/2] net: stmmac: use correct DMA buffer size in the RX descriptor

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Date:   Thu, 19 Dec 2019 16:41:43 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Aviraj CJ <acj@...co.com>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        xe-linux-external@...co.com
Subject: Re: [PATCH stable v4.14 1/2] net: stmmac: use correct DMA buffer
 size in the RX descriptor

On Wed, Dec 18, 2019 at 05:17:19AM -0800, Aviraj CJ wrote:
> upstream 583e6361414903c5206258a30e5bd88cb03c0254 commit
> 
> We always program the maximum DMA buffer size into the receive descriptor,
> although the allocated size may be less. E.g. with the default MTU size
> we allocate only 1536 bytes. If somebody sends us a bigger frame, then
> memory may get corrupted.
> 
> Program DMA using exact buffer sizes.
> 
> Signed-off-by: Aaro Koskinen <aaro.koskinen@...ia.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> [acj: backport v4.14 -stable
> - adjust context
> - skipped the section modifying non-existent functions in dwxgmac2_descs.c and
> hwif.h ]
> Signed-off-by: Aviraj CJ <acj@...co.com>

Thanks for all of the backports, all now queued up.

greg k-h