From: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
To: benve@cisco.com, _govind@gmx.com, davem@davemloft.net, kuba@kernel.org
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Subject: [PATCH v2] ethernet:enic: Fix a use after free bug in enic_hard_start_xmit
Date: Sun, 2 May 2021 04:58:18 -0700 [thread overview]
Message-ID: <20210502115818.3523-1-lyl2019@mail.ustc.edu.cn> (raw)
In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside
enic_queue_wq_skb, if some error happens, the skb will be freed
by dev_kfree_skb(skb). But the freed skb is still used in
skb_tx_timestamp(skb).
My patch makes enic_queue_wq_skb() return error and goto spin_unlock()
incase of error. The solution is provided by Govind.
See https://lkml.org/lkml/2021/4/30/961.
Fixes: fb7516d42478e ("enic: add sw timestamp support")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
---
drivers/net/ethernet/cisco/enic/enic_main.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
index f04ec53544ae..b1443ff439de 100644
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -768,7 +768,7 @@ static inline int enic_queue_wq_skb_encap(struct enic *enic, struct vnic_wq *wq,
return err;
}
-static inline void enic_queue_wq_skb(struct enic *enic,
+static inline int enic_queue_wq_skb(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb)
{
unsigned int mss = skb_shinfo(skb)->gso_size;
@@ -814,6 +814,7 @@ static inline void enic_queue_wq_skb(struct enic *enic,
wq->to_use = buf->next;
dev_kfree_skb(skb);
}
+ return err;
}
/* netif_tx_lock held, process context with BHs disabled, or BH */
@@ -857,7 +858,8 @@ static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
return NETDEV_TX_BUSY;
}
- enic_queue_wq_skb(enic, wq, skb);
+ if (enic_queue_wq_skb(enic, wq, skb))
+ goto error;
if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
netif_tx_stop_queue(txq);
@@ -865,6 +867,7 @@ static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
if (!netdev_xmit_more() || netif_xmit_stopped(txq))
vnic_wq_doorbell(wq);
+error:
spin_unlock(&enic->wq_lock[txq_map]);
return NETDEV_TX_OK;
--
2.25.1
next reply other threads:[~2021-05-02 11:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-02 11:58 Lv Yunlong [this message]
2021-05-03 7:21 ` [PATCH v2] ethernet:enic: Fix a use after free bug in enic_hard_start_xmit Govindarajulu Varadarajan (gvaradar)
2021-05-03 20:30 ` patchwork-bot+netdevbpf
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