This is a note to let you know that I've just added the patch titled
net: ethernet: lantiq_etop: fix memory disclosure
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-ethernet-lantiq_etop-fix-memory-disclosure.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 30c1a477413c8a6f5a0ff6d47864b5e619a87e84
Author: Aleksander Jan Bajkowski <olek2@xxxxx>
Date: Mon Sep 23 23:49:49 2024 +0200
net: ethernet: lantiq_etop: fix memory disclosure
[ Upstream commit 45c0de18ff2dc9af01236380404bbd6a46502c69 ]
When applying padding, the buffer is not zeroed, which results in memory
disclosure. The mentioned data is observed on the wire. This patch uses
skb_put_padto() to pad Ethernet frames properly. The mentioned function
zeroes the expanded buffer.
In case the packet cannot be padded it is silently dropped. Statistics
are also not incremented. This driver does not support statistics in the
old 32-bit format or the new 64-bit format. These will be added in the
future. In its current form, the patch should be easily backported to
stable versions.
Ethernet MACs on Amazon-SE and Danube cannot do padding of the packets
in hardware, so software padding must be applied.
Fixes: 504d4721ee8e ("MIPS: Lantiq: Add ethernet driver")
Signed-off-by: Aleksander Jan Bajkowski <olek2@xxxxx>
Reviewed-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>
Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Link: https://patch.msgid.link/20240923214949.231511-2-olek2@xxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/lantiq_etop.c b/drivers/net/ethernet/lantiq_etop.c
index b41822d08649d..d492b8899d32a 100644
--- a/drivers/net/ethernet/lantiq_etop.c
+++ b/drivers/net/ethernet/lantiq_etop.c
@@ -478,7 +478,9 @@ ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
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;
+ len = skb->len;
if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
netdev_err(dev, "tx ring full\n");
