[PATCH 6.0 135/157] ravb: Fix potential use-after-free in ravb_rx_gbeth()

Greg Kroah-Hartman
2022-12-12T13:46:12Z

From: YueHaibing <yuehaibing@huawei.com>

[ Upstream commit 5a5a3e564de6a8db987410c5c2f4748d50ea82b8 ]

The skb is delivered to napi_gro_receive() which may free it, after calling this,
dereferencing skb may trigger use-after-free.

Fixes: 1c59eb678cbd ("ravb: Fillup ravb_rx_gbeth() stub")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20221203092941.10880-1-yuehaibing@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/renesas/ravb_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 44f9b31f8b99..77d4f3eab971 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -835,7 +835,7 @@ static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q)
napi_gro_receive(&priv->napi[q],
priv->rx_1st_skb);
stats->rx_packets++;
- stats->rx_bytes += priv->rx_1st_skb->len;
+ stats->rx_bytes += pkt_len;
break;
}
}
--
2.35.1