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ipv6: discard IP frag queue on more errors 

This is similar to how ipv4 now behaves:
commit 0ff89efb52 ("ip: fail fast on IP defrag errors").

Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Oskolkov 2018-09-21 11:17:15 -07:00 committed by David S. Miller
parent 075e264fa3
commit 2475f59c61
1 changed files with 6 additions and 5 deletions
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11
net/ipv6/reassembly.c
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@ -145,7 +145,7 @@ static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
*/
if (end < fq->q.len ||
((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
goto err;
goto discard_fq;
fq->q.flags |= INET_FRAG_LAST_IN;
fq->q.len = end;
} else {
@ -162,20 +162,20 @@ static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
if (end > fq->q.len) {
/* Some bits beyond end -> corruption. */
if (fq->q.flags & INET_FRAG_LAST_IN)
goto err;
goto discard_fq;
fq->q.len = end;
}
}
if (end == offset)
goto err;
goto discard_fq;
/* Point into the IP datagram 'data' part. */
if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data))
goto err;
goto discard_fq;
if (pskb_trim_rcsum(skb, end - offset))
goto err;
goto discard_fq;
/* Find out which fragments are in front and at the back of us
* in the chain of fragments so far. We must know where to put
@ -418,6 +418,7 @@ out_fail:
rcu_read_lock();
__IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
rcu_read_unlock();
inet_frag_kill(&fq->q);
return -1;
}