ethernet:enic: Fix a use after free bug in enic_hard_start_xmit

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[ Upstream commit 643001b47a ]

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: fb7516d424 ("enic: add sw timestamp support")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Acked-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Lv Yunlong 2021-05-02 04:58:18 -07:00 • committed by Greg Kroah-Hartman

parent 3d808916d2

commit 7afdd6aba9

1 changed files with 5 additions and 2 deletions

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drivers/net/ethernet/cisco/enic/enic_main.c

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