From: Xin Long <lucien.xin@xxxxxxxxx>
Date: Mon, 24 Oct 2016 01:01:09 +0800
> Commit 7303a1475008 ("sctp: identify chunks that need to be fragmented
> at IP level") made the chunk be fragmented at IP level in the next round
> if it's size exceed PMTU.
>
> But there still is another case, PMTU can be updated if transport's dst
> expires and transport's pmtu_pending is set in sctp_packet_transmit. If
> the new PMTU is less than the chunk, the same issue with that commit can
> be triggered.
>
> So we should drop this packet and let it retransmit in another round
> where it would be fragmented at IP level.
>
> This patch is to fix it by checking the chunk size after PMTU may be
> updated and dropping this packet if it's size exceed PMTU.
>
> Fixes: 90017accff61 ("sctp: Add GSO support")
> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Applied, and queued up for -stable, thanks!
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