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Message-Id: <20240713223357.2911169-1-olek2@wp.pl>
Date: Sun, 14 Jul 2024 00:33:57 +0200
From: Aleksander Jan Bajkowski <olek2@...pl>
To: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
olek2@...pl,
shannon.nelson@....com,
sd@...asysnail.net,
u.kleine-koenig@...gutronix.de,
john@...ozen.org,
ralf@...ux-mips.org,
ralph.hempel@...tiq.com,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH net] net: ethernet: lantiq_etop: fix memory disclosure
When applying padding, the buffer is not zeroed, which results in
memory disclosure. This patch uses skb_put_padto() to pad Ethernet
frames properly.
It appears that only the MAC in xrx100 and newer SoCs supports
padding by hardware, so software padding must be applied.
Fixes: 504d4721ee8e ("MIPS: Lantiq: Add ethernet driver")
Signed-off-by: Aleksander Jan Bajkowski <olek2@...pl>
---
drivers/net/ethernet/lantiq_etop.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/lantiq_etop.c b/drivers/net/ethernet/lantiq_etop.c
index 0b9982804370..196715d9ea43 100644
--- a/drivers/net/ethernet/lantiq_etop.c
+++ b/drivers/net/ethernet/lantiq_etop.c
@@ -478,11 +478,11 @@ ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
struct ltq_etop_priv *priv = netdev_priv(dev);
struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1];
struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
- int len;
unsigned long flags;
u32 byte_offset;
- len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
+ if (skb_put_padto(skb, ETH_ZLEN))
+ return NETDEV_TX_OK;
if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
netdev_err(dev, "tx ring full\n");
@@ -497,12 +497,13 @@ ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
netif_trans_update(dev);
spin_lock_irqsave(&priv->lock, flags);
- desc->addr = ((unsigned int)dma_map_single(&priv->pdev->dev, skb->data, len,
- DMA_TO_DEVICE)) - byte_offset;
+ desc->addr = ((unsigned int)dma_map_single(&priv->pdev->dev, skb->data,
+ skb->len, DMA_TO_DEVICE)) -
+ byte_offset;
/* Make sure the address is written before we give it to HW */
wmb();
desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
- LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
+ LTQ_DMA_TX_OFFSET(byte_offset) | (skb->len & LTQ_DMA_SIZE_MASK);
ch->dma.desc++;
ch->dma.desc %= LTQ_DESC_NUM;
spin_unlock_irqrestore(&priv->lock, flags);
--
2.39.2
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