This is a note to let you know that I've just added the patch titled
net: dpaa: Pad packets to ETH_ZLEN
to the 5.10-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-dpaa-pad-packets-to-eth_zlen.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 39723a7ebfcbee625fbea71fe9b5171169cf147a
Author: Sean Anderson <sean.anderson@xxxxxxxxx>
Date: Tue Sep 10 10:31:44 2024 -0400
net: dpaa: Pad packets to ETH_ZLEN
[ Upstream commit cbd7ec083413c6a2e0c326d49e24ec7d12c7a9e0 ]
When sending packets under 60 bytes, up to three bytes of the buffer
following the data may be leaked. Avoid this by extending all packets to
ETH_ZLEN, ensuring nothing is leaked in the padding. This bug can be
reproduced by running
$ ping -s 11 destination
Fixes: 9ad1a3749333 ("dpaa_eth: add support for DPAA Ethernet")
Suggested-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Link: https://patch.msgid.link/20240910143144.1439910-1-sean.anderson@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index 90bd5583ac34..cf7e9b26a0e3 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -2155,12 +2155,12 @@ static netdev_tx_t
dpaa_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
{
const int queue_mapping = skb_get_queue_mapping(skb);
- bool nonlinear = skb_is_nonlinear(skb);
struct rtnl_link_stats64 *percpu_stats;
struct dpaa_percpu_priv *percpu_priv;
struct netdev_queue *txq;
struct dpaa_priv *priv;
struct qm_fd fd;
+ bool nonlinear;
int offset = 0;
int err = 0;
@@ -2170,6 +2170,13 @@ dpaa_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
qm_fd_clear_fd(&fd);
+ /* Packet data is always read as 32-bit words, so zero out any part of
+ * the skb which might be sent if we have to pad the packet
+ */
+ if (__skb_put_padto(skb, ETH_ZLEN, false))
+ goto enomem;
+
+ nonlinear = skb_is_nonlinear(skb);
if (!nonlinear) {
/* We're going to store the skb backpointer at the beginning
* of the data buffer, so we need a privately owned skb
