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Maxim reported several issues when forcing a TCP transparent proxy to use the MPTCP protocol for the inbound connections. He also provided a clean reproducer. The problem boils down to 'mptcp_frag_can_collapse_to()' assuming that only MPTCP will use the given page_frag. If others - e.g. the plain TCP protocol - allocate page fragments, we can end-up re-using already allocated memory for mptcp_data_frag. Fix the issue ensuring that the to-be-expanded data fragment is located at the current page frag end. v1 -> v2: - added missing fixes tag (Mat) Closes: #178 Reported-and-tested-by: Maxim Galaganov <[email protected]> Fixes: 18b683b ("mptcp: queue data for mptcp level retransmission") Signed-off-by: Paolo Abeni <[email protected]> Reviewed-by: Mat Martineau <[email protected]>
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