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UPSTREAM: bpf: Move skb->len == 0 checks into __bpf_redirect

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[ Upstream commit 114039b342014680911c35bd6b72624180fd669a ]

To avoid potentially breaking existing users.

Both mac/no-mac cases have to be amended; mac_header >= network_header
is not enough (verified with a new test, see next patch).

Fixes: fd1894224407 ("bpf: Don't redirect packets with invalid pkt_len")
Change-Id: I470a3f592f33f59523b741c44322c6a601cde1af
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20221121180340.1983627-1-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Stanislav Fomichev 2022-11-21 10:03:39 -08:00 • committed by basamaryan
commit 0dae2e85f8
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3
net/bpf/test_run.c
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@ -440,9 +440,6 @@ static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
{
struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
if (!skb->len)
return -EINVAL;
if (!__skb)
return 0;