ip_vti: fix potential slab-use-after-free in decode_session6

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[ Upstream commit 6018a26627 ]

When ip_vti device is set to the qdisc of the sfb type, the cb field
of the sent skb may be modified during enqueuing. Then,
slab-use-after-free may occur when ip_vti device sends IPv6 packets.
As commit f855691975 ("xfrm6: Fix the nexthdr offset in
_decode_session6.") showed, xfrm_decode_session was originally intended
only for the receive path. IP6CB(skb)->nhoff is not set during
transmission. Therefore, set the cb field in the skb to 0 before
sending packets.

Fixes: f855691975 ("xfrm6: Fix the nexthdr offset in _decode_session6.")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Zhengchao Shao 2023-07-10 17:40:53 +08:00 • committed by Greg Kroah-Hartman

parent 55ad230920

commit 2b05bf5dc4

1 changed files with 2 additions and 2 deletions

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net/ipv4/ip_vti.c

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