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net/sched: act_mirred: don't override retval if we already lost the skb

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[ Upstream commit 166c2c8a6a4dc2e4ceba9e10cfe81c3e469e3210 ]

If we're redirecting the skb, and haven't called tcf_mirred_forward(),
yet, we need to tell the core to drop the skb by setting the retcode
to SHOT. If we have called tcf_mirred_forward(), however, the skb
is out of our hands and returning SHOT will lead to UaF.

Move the retval override to the error path which actually need it.

Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Fixes: e5cf1baf92 ("act_mirred: use TC_ACT_REINSERT when possible")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-02-15 06:33:46 -08:00 • committed by Greg Kroah-Hartman
parent 7c787888d1
commit 28cdbbd38a
1 changed files with 10 additions and 12 deletions
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22
net/sched/act_mirred.c
View file

@ -240,8 +240,7 @@ static int tcf_mirred_to_dev(struct sk_buff *skb, struct tcf_mirred *m,
if (unlikely(!(dev->flags & IFF_UP)) || !netif_carrier_ok(dev)) {
net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
dev->name);
err = -ENODEV;
goto out;
goto err_cant_do;
}
/* we could easily avoid the clone only if called by ingress and clsact;
@ -253,10 +252,8 @@ static int tcf_mirred_to_dev(struct sk_buff *skb, struct tcf_mirred *m,
tcf_mirred_can_reinsert(retval);
if (!dont_clone) {
skb_to_send = skb_clone(skb, GFP_ATOMIC);
if (!skb_to_send) {
err = -ENOMEM;
goto out;
}
if (!skb_to_send)
goto err_cant_do;
}
want_ingress = tcf_mirred_act_wants_ingress(m_eaction);
@ -293,15 +290,16 @@ static int tcf_mirred_to_dev(struct sk_buff *skb, struct tcf_mirred *m,
} else {
err = tcf_mirred_forward(at_ingress, want_ingress, skb_to_send);
}
if (err) {
out:
if (err)
tcf_action_inc_overlimit_qstats(&m->common);
if (is_redirect)
retval = TC_ACT_SHOT;
}
return retval;
err_cant_do:
if (is_redirect)
retval = TC_ACT_SHOT;
tcf_action_inc_overlimit_qstats(&m->common);
return retval;
}
TC_INDIRECT_SCOPE int tcf_mirred_act(struct sk_buff *skb,