diff options
| author |   Sean Anderson <sean.anderson@linux.dev> | 2024-09-10 10:31:44 -0400 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2024-09-11 16:01:25 -0700 |
| commit | cbd7ec083413c6a2e0c326d49e24ec7d12c7a9e0 (patch) | |
| tree | 5f80b68e9558f1f4c0e175f02d611ad312318fbb | |
| parent | mptcp: pm: Fix uaf in __timer_delete_sync (diff) | |
| download | wireguard-linux-cbd7ec083413c6a2e0c326d49e24ec7d12c7a9e0.tar.xz wireguard-linux-cbd7ec083413c6a2e0c326d49e24ec7d12c7a9e0.zip | |
net: dpaa: Pad packets to ETH_ZLEN
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@google.com>
Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240910143144.1439910-1-sean.anderson@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c index cfe6b57b1da0..4a55e521c17e 100644 --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c @@ -2272,12 +2272,12 @@ 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; @@ -2287,6 +2287,13 @@ 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 |