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Message-ID: <20240702210838.2703228-1-rrendec@redhat.com>
Date: Tue, 2 Jul 2024 17:08:37 -0400
From: Radu Rendec <rrendec@...hat.com>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
"David S. Miller" <davem@...emloft.net>,
Paolo Abeni <pabeni@...hat.com>
Cc: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>,
Jakub Kicinski <kuba@...nel.org>,
Simon Horman <horms@...nel.org>,
netdev@...r.kernel.org,
linux-renesas-soc@...r.kernel.org
Subject: [PATCH] net: rswitch: Avoid use-after-free in rswitch_poll()
The use-after-free is actually in rswitch_tx_free(), which is inlined in
rswitch_poll(). Since `skb` and `gq->skbs[gq->dirty]` are in fact the
same pointer, the skb is first freed using dev_kfree_skb_any(), then the
value in skb->len is used to update the interface statistics.
Let's move around the instructions to use skb->len before the skb is
freed.
This bug is trivial to reproduce using KFENCE. It will trigger a splat
every few packets. A simple ARP request or ICMP echo request is enough.
Signed-off-by: Radu Rendec <rrendec@...hat.com>
---
drivers/net/ethernet/renesas/rswitch.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index dcab638c57fe8..24c90d8f5a442 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/drivers/net/ethernet/renesas/rswitch.c
@@ -871,13 +871,13 @@ static void rswitch_tx_free(struct net_device *ndev)
dma_rmb();
skb = gq->skbs[gq->dirty];
if (skb) {
+ rdev->ndev->stats.tx_packets++;
+ rdev->ndev->stats.tx_bytes += skb->len;
dma_unmap_single(ndev->dev.parent,
gq->unmap_addrs[gq->dirty],
skb->len, DMA_TO_DEVICE);
dev_kfree_skb_any(gq->skbs[gq->dirty]);
gq->skbs[gq->dirty] = NULL;
- rdev->ndev->stats.tx_packets++;
- rdev->ndev->stats.tx_bytes += skb->len;
}
desc->desc.die_dt = DT_EEMPTY;
}
--
2.45.2
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