On Sun, Aug 07, 2016 at 02:15:13PM +0800, Xin Long wrote:
> Commit 52253db924d1 ("sctp: also point GSO head_skb to the sk when
> it's available") used event->chunk->head_skb to get the head_skb in
> sctp_ulpevent_set_owner().
>
> But at that moment, the event->chunk was NULL, as it cloned the skb
> in sctp_ulpevent_make_rcvmsg(). Therefore, that patch didn't really
> work.
>
> This patch is to move the event->chunk initialization before calling
> sctp_ulpevent_receive_data() so that it uses event->chunk when it's
> valid.
>
> Fixes: 52253db924d1 ("sctp: also point GSO head_skb to the sk when it's available")
> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
> ---
> net/sctp/ulpevent.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
> index 1bc4f71..d85b803 100644
> --- a/net/sctp/ulpevent.c
> +++ b/net/sctp/ulpevent.c
> @@ -702,14 +702,14 @@ struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
> */
> sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff));
>
> - sctp_ulpevent_receive_data(event, asoc);
> -
> /* And hold the chunk as we need it for getting the IP headers
> * later in recvmsg
> */
> sctp_chunk_hold(chunk);
> event->chunk = chunk;
>
> + sctp_ulpevent_receive_data(event, asoc);
> +
> event->stream = ntohs(chunk->subh.data_hdr->stream);
> event->ssn = ntohs(chunk->subh.data_hdr->ssn);
> event->ppid = chunk->subh.data_hdr->ppid;
> --
> 2.1.0
>
> --
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>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
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