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Message-ID: <Y9Y/jMZZbS4HNpCC@unreal>
Date: Sun, 29 Jan 2023 11:42:36 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Florian Fainelli <f.fainelli@...il.com>
Cc: netdev@...r.kernel.org, maxime@...no.tech,
Doug Berger <opendmb@...il.com>,
Broadcom internal kernel review list
<bcm-kernel-feedback-list@...adcom.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: bcmgenet: Add a check for oversized packets
On Thu, Jan 26, 2023 at 04:08:19PM -0800, Florian Fainelli wrote:
> Occasionnaly we may get oversized packets from the hardware which
> exceed the nomimal 2KiB buffer size we allocate SKBs with. Add an early
> check which drops the packet to avoid invoking skb_over_panic() and move
> on to processing the next packet.
>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
> drivers/net/ethernet/broadcom/genet/bcmgenet.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> index 21973046b12b..d937daa8ee88 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> @@ -2316,6 +2316,14 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring,
> __func__, p_index, ring->c_index,
> ring->read_ptr, dma_length_status);
>
> + if (unlikely(len > RX_BUF_LENGTH)) {
> + netif_err(priv, rx_status, dev, "oversized packet\n");
I don't think that it is wise move to print to dmesg something that can
be triggered by user over network.
Thanks
> + dev->stats.rx_length_errors++;
> + dev->stats.rx_errors++;
> + dev_kfree_skb_any(skb);
> + goto next;
> + }
> +
> if (unlikely(!(dma_flag & DMA_EOP) || !(dma_flag & DMA_SOP))) {
> netif_err(priv, rx_status, dev,
> "dropping fragmented packet!\n");
> --
> 2.25.1
>
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