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sctp: also point GSO head_skb to the sk when it's available

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The head skb for GSO packets won't travel through the inner depths of
SCTP stack as it doesn't contain any chunks on it. That means skb->sk
doesn't get set and then when sctp_recvmsg() calls
sctp_inet6_skb_msgname() on the head_skb it panics, as this last needs
to check flags at the socket (sp->v4mapped).

The fix is to initialize skb->sk for th head skb once we are able to do
it. That is, when the first chunk is processed.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2016-07-23 00:33:44 -03:00 committed by David S. Miller
parent eefc1b1d10
commit 52253db924
1 changed files with 3 additions and 0 deletions
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3
net/sctp/ulpevent.c
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@ -91,6 +91,7 @@ int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event)
static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event,
const struct sctp_association *asoc)
{
struct sctp_chunk *chunk = event->chunk;
struct sk_buff *skb;
/* Cast away the const, as we are just wanting to
@ -101,6 +102,8 @@ static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event,
event->asoc = (struct sctp_association *)asoc;
atomic_add(event->rmem_len, &event->asoc->rmem_alloc);
sctp_skb_set_owner_r(skb, asoc->base.sk);
if (chunk && chunk->head_skb && !chunk->head_skb->sk)
chunk->head_skb->sk = asoc->base.sk;
}
/* A simple destructor to give up the reference to the association. */